Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1437436a7f51bc…

MALICIOUS

PDF

35.9 KB Authoring application: Solid Converter PDF
MD5: b0d14a13691270eb8fd3a5c86439b7ac SHA-1: 7d35574bbcad51ec23aea279c6ec3d11f8b2e889 SHA-256: ac1437436a7f51bc8278e03d32c34d0947adb4328e968da567f1dd3e4e1c5799
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, mentions 'cover letter for resume format', aligning with the link farm's likely purpose of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://needleworksacupuncture.com/uploads/1/3/0/5/130589058/1171501.pdf
    • http://nationalpostcards.ie/uploads/1/3/0/5/130588463/4888689.pdf
    • http://fancysneaker.com/uploads/1/3/0/5/130543575/mepaxejobimovij.pdf
    • http://nihaostyle.com/uploads/1/3/0/5/130590047/kevosegopoxododuzo.pdf
    • http://thebestpotshop.com/uploads/1/3/0/3/130323163/2786381.pdf
    • http://yourdedicatedtravelagent.com/uploads/1/3/0/5/130590561/kezafezafegogu_tibegawosipi.pdf
    • http://citizensfirstfinancialgroup.com/uploads/1/3/0/6/130620172/130620172.html#cover+letter+for+resume+format

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003af0.bin
b1fde04925b007439addd3bd28ded34aa172f775f73ebeda7ffa5b0448433aaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3AF0 7740 bytes

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