Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51e1d621f780d31…

MALICIOUS

PDF

35.5 KB Created: 2020-04-19 11:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: adfdfa68309793ddad24daee8f5fc17e SHA-1: fbc2327c11936b8fe580e6505e1549f7563c5f2f SHA-256: d51e1d621f780d31cd1125a38761b5f393e232e6186baf9f376cf58408b57973
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'Igcse article writing examples pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://teachcoachlead.org/uploads/1/3/0/5/130551391/130551391.html#igcse+article+writing+examples+pdf
    • http://enchantingtherapies.com/uploads/1/3/0/8/130874067/d0f6441.pdf
    • http://yourhomeinto.com/uploads/1/3/0/6/130621626/7b5e4d31da375e.pdf
    • http://beautybylola.co/uploads/1/3/0/8/130873903/najibomowo_senev_barurewe.pdf
    • http://frosthoneybeefarm.com/uploads/1/3/1/0/131070030/04042c1b.pdf
    • http://chapelofhopecogic.com/uploads/1/3/0/2/130291545/foninuwojalow-koselaj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006253.bin
5b4df892d897b2c5d3bf198f1b3e7377467cca607c5d2132619b9b23e7a3aac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6253 7820 bytes

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