Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6866920320fa47…

MALICIOUS

PDF

38.8 KB Authoring application: Karbon
MD5: d884236022f7de29443fa11a99f668b6 SHA-1: b93638b6895b7018da346695b0987d2e48b87e91 SHA-256: ad6866920320fa47a78d6c4d32e11233f44dc1eb05800665c2b1b798bda412b9
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_LINK_FARM' explicitly identifies the mass external PDF link farm, with the primary URL being http://kexose.ratiborus.ru/uploads/2020/01/28/13f4a331e3.pdf. No scripts were extracted, limiting the analysis of specific execution behaviors.

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://kexose.ratiborus.ru/uploads/2020/01/28/13f4a331e3.pdf
    • http://ahanna.org/uploads/1/3/0/6/130640019/6897225.pdf
    • http://davidbaskind.com/uploads/1/3/0/4/130476539/911904.pdf
    • http://mtbakercrossfit.com/uploads/1/3/0/2/130287371/kugezuxuxarugiwawil.pdf
    • http://blockchainambassador.ca/uploads/1/3/0/5/130590325/dawob.pdf
    • http://balancedforlifeyogatherapy.com/uploads/1/3/0/6/130640179/xilajoxek-zamoxax-xobawovazor-megof.pdf
    • http://coolmanraulh.com/uploads/1/3/0/6/130621757/130621757.html#hhv-6+encephalitis+immunocompetent

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000111f.bin
4823c7bdba0a7bf4526b58bec6f8e8ec81f1c4912832c02d9676f3ec3e48f05d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111F 8200 bytes

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