f21db05eeb971b05c3d5ab13c1a5309a88698c3ee29f5c32084da693a17e3b7f

Analysis

max time kernel
149s
max time network
149s
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/PdfPreview.dll
Size 604KB
Sample260812-c653yaab48
SHA256 f21db05eeb971b05c3d5ab13c1a5309a88698c3ee29f5c32084da693a17e3b7f
MD5 d2f82307fbb953d573f18d2005f99414
SHA1 dade7fb23789547a36a40a005c96dbfffe0ed3f1
SHA512 e8afe7eac8ce8ffc13f97e62c6e7a9bbcea4c61651abe5029e08a8b169970135347aff9b5805cbd78b5c9dc424d679ea64738cb38ad4b403e29dbba0a168fd32
SSDEEP 12288:N6f3A0UHVmVgK8VYKH2lbfkCnaPDj/yv9UKMv8jkwdE4gJvQ2xRdCm8/DivdqV0M:N6PbiH2lbfkCnaPDeFUKY1n4YvB3Usqk
TLSH
T12CD4AD13F882D1B1E4A90030A27DFB7B597C6A3017185CCBE7D04D7969246D36B3AB9E
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 24 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\.pdf\shellex\{e357fccd-a995-4576-b01f-234630154e96}\ = "{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.pdf\ShellEx\{8895b1c6-b41f-4c1c-a562-0d564250836f}\ = "{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}"	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\.pdf\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\.pdf\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}\ = "{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}"	regsvr32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\ = "SumatraPDF Preview (*.pdf)"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\AppId = "{6d2b5079-2f0b-48dd-ab7f-97cec514d30b}"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\InProcServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\mopdf\\PdfPreview.dll"	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\InProcServer32\ThreadingModel = "Apartment"	regsvr32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\.pdf\shellex\{e357fccd-a995-4576-b01f-234630154e96}	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\.pdf\shellex	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\DisplayName = "SumatraPDF Preview (*.pdf)"	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\DisplayName = "SumatraPDF Preview (*.pdf)"	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\.pdf\ShellEx\{e357fccd-a995-4576-b01f-234630154e96}\ = "{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}"	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\.pdf\shellex\{e357fccd-a995-4576-b01f-234630154e96}	regsvr32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\.pdf\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\ = "SumatraPDF Preview (*.pdf)"	regsvr32.exe
Key created	\REGISTRY\MACHINE\Software\Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\InProcServer32	regsvr32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\InProcServer32\ThreadingModel = "Apartment"	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\AppId = "{6d2b5079-2f0b-48dd-ab7f-97cec514d30b}"	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\InProcServer32	regsvr32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\WOW6432Node\CLSID\{3D3B1846-CC43-42AE-BFF9-D914083C2BA3}\InProcServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\mopdf\\PdfPreview.dll"	regsvr32.exe
Key created	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000_Classes\.pdf	regsvr32.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 2196 wrote to memory of 1272	2196	regsvr32.exe	86

C:\Windows\system32\regsvr32.exe
regsvr32 /s C:\Users\Admin\AppData\Local\Temp\mopdf\PdfPreview.dll
1⤵
- Suspicious use of WriteProcessMemory
PID:2196
- C:\Windows\SysWOW64\regsvr32.exe
  /s C:\Users\Admin\AppData\Local\Temp\mopdf\PdfPreview.dll
  2⤵
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  PID:1272

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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