Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7c655e85735ccf…

MALICIOUS

PDF

39.6 KB Authoring application: LibreOffice
MD5: ae51e07007456df26f44f00e8464d4ac SHA-1: cb2f3242d42f0eb51582a981fab11aa040912f28 SHA-256: 3e7c655e85735ccf37f09bc6b3d3e314421c8141723ec7826d4b228cfc2120d8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, mentions 'W 4 withholding form instructions', which is likely a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://canberracelebranteileen.com/uploads/1/3/0/2/130270987/1c3b941c4c.pdf
    • http://nc-customdesigns.com/uploads/1/3/0/2/130288419/ff079560737.pdf
    • http://portlandareabankruptcy.com/uploads/1/3/0/6/130604459/tuxazu-vadepabajabugak.pdf
    • http://nacionallegacy.com.br/uploads/1/3/0/5/130589261/6d0331.pdf
    • http://houseofmapa.com/uploads/1/3/0/4/130483781/7621889.pdf
    • http://disabilitymanagmentsolutions.ca/uploads/1/3/0/6/130621503/442be277.pdf
    • http://tapleydugas.com/uploads/1/3/0/6/130604923/vaxebukew_mubik_maxojufotiwikat_bapisekaj.pdf
    • http://namiokcmetro.com/uploads/1/3/0/4/130476342/numefuwedi.pdf
    • http://neokundalini.org/uploads/1/3/0/7/130739250/130739250.html#w+4+withholding+form+instructions

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000122a.bin
cdb49ee90c2982a743c2a915dd1218a9701afc04f0598e927c226bf835505fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122A 8728 bytes

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