Malicious PDF — malware analysis report

Static analysis result for SHA-256 953514ad23fa64b3…

MALICIOUS

PDF

1.44 MB Created: 2009-03-03 13:06:43 -05:00 Authoring application: groff version 1.18.1.4 (via GPL Ghostscript 8.61)
MD5: e55111e98c95a847149e9edbe88fdea7 SHA-1: 34273db8b0b374ea33e9b4d01223c73b8f11972c SHA-256: 953514ad23fa64b33038187b733503a96aad3f6b216436b3c65ae8bb4ee02c45
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1204.002 Malicious File

The PDF file contains a launch action that executes cmd.exe with a complex command. This command appears to search for specific PDF files, process them with 'debug', rename a resulting file to '.exe', and then execute it. This suggests a downloader or dropper functionality. The ML classifier also flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7644

Heuristics 3

  • Launch action critical PDF_LAUNCH
    PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
  • /Launch action target: c:\\windows\\system32\\cmd.exe critical PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/C findstr splipemxly *.pdf > fjlnc.src && debug < fjlnc.src > out.txt && rename yqtxs.txt yqtxs.exe && start yqtxs.exe' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

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