Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc31bfbf58de73e8…

MALICIOUS

PDF

39.2 KB Created: 2020-05-16 07:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 96233b8cead99a8ce4b9b7f91f74969a SHA-1: ff4a608c55c1efff103514c12da45ea647c9f46f SHA-256: bc31bfbf58de73e87dcf64f78d17a3d67c0cc81c8fe921cf56deb64314b1b9db
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the presence of numerous external links is a common technique for distributing malicious content or driving traffic. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://divinesking.com/uploads/1/3/1/8/131871727/131871727.html#latest+action+movies+online PDF link annotation
    • http://awningsfarmington.com/uploads/1/3/1/1/131164471/kotanenixamot_saguxu_xalovepolute_xisatel.pdfIn PDF document text
    • http://petropoint.net/uploads/1/3/0/4/130494801/fororego.pdfIn PDF document text
    • http://primecutmowinggarden.info/uploads/1/3/0/2/130289553/gelixi.pdfIn PDF document text
    • http://themotherhoodlist.com/uploads/1/3/0/6/130620555/mebikub-misosagulozewuk-tigulokin-puxofijolan.pdfIn PDF document text
    • http://emlind.com/uploads/1/3/0/5/130541271/wufoxewipotik-weled.pdfIn PDF document text
    • http://yogawithkk.com/uploads/1/3/0/6/130621836/padarebisomaboz_gidisidu.pdfIn PDF document text
    • http://parakaleopsalms.com/uploads/1/3/0/8/130874668/853721bd.pdfIn PDF document text
    • http://thompsonmultiservices.com/uploads/1/3/0/8/130814676/gezixesaziw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE8 10256 bytes
SHA-256: 5e8c5b3cb59ce4cc0663fb1575737b9b1b1c8bd2c27ed3b6afc0e173c82522a3

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