874df2c1019efd7c87a64b911672f82fefff6f8f182ee30604c920e46e80fd2f

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20260513-en
resource tags

arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
12/08/2026, 02:42

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General

Target
mopdf/PdfFilter.dll
Size 203KB
Sample260812-c653yaab48
SHA256 874df2c1019efd7c87a64b911672f82fefff6f8f182ee30604c920e46e80fd2f
MD5 335b09e89ba87300ef28c81e6d70a1d2
SHA1 6c5abf52be4caeef4df65dfc2588a7c7004a92f7
SHA512 5aa713e70b7c587fae941ac93848f08a1c47d1e73582adcac11473e51798871a86ce6ffd727ead2494830c35e9a2271d1f043a862b91c41bed22cb3b4939317b
SSDEEP 6144:rzjNbQL1hw44lT9fOTUrb2FKSsuoDBGx/n:rf6L1hilT9fOTUrb2Eyln
TLSH
T180148D10B9C0C832D9AE1430656FDB76193DB5201F7899CFA7885D399E206C39339FAB
MD5 SHA1 SHA512 SSDEEP TLSH

Score

7^/10

discovery persistence privilege_escalation

Malware Config

Signatures

Event Triggered Execution: Component Object Model Hijacking 1 TTPs
Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.
persistence privilege_escalation

Component Object Model Hijacking
T1546.015

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe

Modifies registry class 26 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{55808EA8-81FE-43c6-AAE8-1D8149F941D3}\ = "SumatraPDF IFilter"	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\WOW6432Node\CLSID\{55808EA8-81FE-43c6-AAE8-1D8149F941D3}\ = "SumatraPDF IFilter"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{55808EA8-81FE-43c6-AAE8-1D8149F941D3}\InProcServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\mopdf\\PdfFilter.dll"	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\WOW6432Node\CLSID\{55808EA8-81FE-43c6-AAE8-1D8149F941D3}\InProcServer32	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\WOW6432Node\CLSID\{55808EA8-81FE-43c6-AAE8-1D8149F941D3}\InProcServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\mopdf\\PdfFilter.dll"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}\PersistentAddinsRegistered\	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}\PersistentAddinsRegistered	regsvr32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}\PersistentAddinsRegistered\{89BCB740-6119-101A-BCB7-00DD010655AF}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}\PersistentAddinsRegistered\{89BCB740-6119-101A-BCB7-00DD010655AF}\ = "{55808EA8-81FE-43c6-AAE8-1D8149F941D3}"	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}\PersistentAddinsRegistered\{89BCB740-6119-101A-BCB7-00DD010655AF}	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}\PersistentAddinsRegistered\{89BCB740-6119-101A-BCB7-00DD010655AF}\ = "{55808EA8-81FE-43c6-AAE8-1D8149F941D3}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\.pdf\PersistentHandler	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.pdf\PersistentHandler\ = "{26CA6565-F22A-4f5e-B688-0AD051D56E96}"	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\.pdf\PersistentHandler	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}\ = "SumatraPDF IFilter Persistent Handler"	regsvr32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\WOW6432Node\CLSID\{55808EA8-81FE-43c6-AAE8-1D8149F941D3}\InProcServer32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{55808EA8-81FE-43c6-AAE8-1D8149F941D3}\InProcServer32\ThreadingModel = "Both"	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\WOW6432Node\CLSID\{55808EA8-81FE-43c6-AAE8-1D8149F941D3}\InProcServer32\ThreadingModel = "Both"	regsvr32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}\PersistentAddinsRegistered	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}\PersistentAddinsRegistered\	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\.pdf\PersistentHandler\ = "{26CA6565-F22A-4f5e-B688-0AD051D56E96}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\WOW6432Node\CLSID\{55808EA8-81FE-43c6-AAE8-1D8149F941D3}	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000_Classes\WOW6432Node\CLSID\{55808EA8-81FE-43c6-AAE8-1D8149F941D3}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{26CA6565-F22A-4f5e-B688-0AD051D56E96}\ = "SumatraPDF IFilter Persistent Handler"	regsvr32.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 4996 wrote to memory of 2640	4996	regsvr32.exe	83

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\mopdf\PdfFilter.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:4996
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\mopdf\PdfFilter.dll
  2⤵
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  PID:2640

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Event Triggered Execution

T1546

Component Object Model Hijacking

T1546.015

Privilege Escalation

Event Triggered Execution

T1546

Component Object Model Hijacking

T1546.015

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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