Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb614de4bda2222e…

MALICIOUS

PDF

71.4 KB Created: 2010-05-14 14:00:54 +02:00
MD5: dc7eb206cf0a82a4a822241631925823 SHA-1: ae2dbc71411af7a5f45b1bf28f3b0fd516752526 SHA-256: fb614de4bda2222ef7a683e3aca4d8db1747f0067112580b66133bc8f5207343
192 Risk Score

Malware Insights

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

The PDF file contains a critical PDF_LAUNCH heuristic firing, indicating an attempt to execute an external program. Specifically, the PDF_LAUNCH_COMMAND heuristic reveals that cmd.exe is launched with parameters designed to write to a local file, suggesting a command execution payload. The ML_NYX_PDF_MALICIOUS classifier also flagged the document as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7771

Heuristics 5

  • 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: cmd.exe critical PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/C echo hihi >> c:\\coucou.txt && echo toto >> c:\\coucou.txt && echo' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • OpenAction trigger high PDF_OPENACTION
    PDF has an /OpenAction that launches, submits, or opens an external target
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_cff_off00001379.bin
e0b74124f131f1d8e85f1769181d3cdcb2b3a1f2d5d9fac5b13777fc512f46a7		 pdf-font-stream PDF embedded font (cff) at offset 0x1379 85952 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.44, consistent with packed or encrypted content.

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