Malicious PDF — malware analysis report

Static analysis result for SHA-256 053a6b480bc2442b…

MALICIOUS

PDF

43.8 KB Created: 2020-04-04 06:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: efcc22cb6c2206f681a83510f52b7247 SHA-1: 375cda008876b960b636dd8f36921eb0d4614dc8 SHA-256: 053a6b480bc2442b9d88822e403b1b6d3f9b6a0a82e43d46dc75e1f4bc7a5cee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host or link to a large number of other documents. No scripts were extracted, but the primary attack pattern involves directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://theleawoodfamilydentist.com/uploads/1/3/0/8/130814382/130814382.html#hidroxido+de+calcio+uso+industrial
    • http://kennie2signature.com/uploads/1/3/1/4/131453267/bowabobavul-votelutaponi.pdf
    • http://fletcherfac.com/uploads/1/3/0/9/130970009/367196.pdf
    • http://my914.com/uploads/1/3/0/7/130775634/mimewenotesokulev.pdf
    • http://brooksiecooks.com/uploads/1/3/0/4/130436173/xiratavipunema.pdf
    • http://darkestsidesilver.com/uploads/1/3/0/5/130551534/zezawilolurodop.pdf
    • http://drjohnkinahan.com/uploads/1/3/0/5/130551986/bavudalikewawig-pinopijuwuki.pdf
    • http://thedustymillermercantile.com/uploads/1/3/1/3/131381088/buxes.pdf
    • http://janeeyre-design.com/uploads/1/3/0/8/130874563/jeruxonubaxomepeko.pdf
    • http://granite-alexandria.net/uploads/1/3/0/4/130483426/tosejugoviguze.pdf
    • http://muabannhao.net/uploads/1/3/0/2/130291453/2244906.pdf
    • http://colonoscopylosangeles.com/uploads/1/3/0/4/130436125/7724277.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076dd.bin
431f26541876f5c9ba039d0517c7af54bf6e1ab49c9bbd50574405dd6d3ae355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DD 8912 bytes
font_01_sfnt_off00009710.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9710 2652 bytes

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