Malicious PDF — malware analysis report

Static analysis result for SHA-256 7526c646bde3782d…

MALICIOUS

PDF

42.3 KB Created: 2020-04-11 05:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bbd9ed3e3185983a86aedd865017025b SHA-1: 8d00614b881a98c52ed45103261df444ea0450b2 SHA-256: 7526c646bde3782dd36ad40c0197503b3e98a29ef11dcd3b9c714211c9a2e6b5
96 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier as malicious and contains a large number of external links, indicating a link farm or redirection scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to lure users to external, potentially malicious, sites. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://sweetestdreams.org/uploads/1/3/0/9/130969937/130969937.html#sky+guide+nz
    • http://iberoempaques.com/uploads/1/3/1/0/131069806/buximaxozewo_xarudo_rotusaboj.pdf
    • http://thesunnyshopper.com/uploads/1/3/0/4/130490193/9343898.pdf
    • http://studentmin.net/uploads/1/3/0/5/130588773/5cb73470f.pdf
    • http://richardhaddawayauthor.com/uploads/1/3/0/2/130291416/wubivubero.pdf
    • http://knutesonphotography.com/uploads/1/3/0/4/130476060/jolimugubezakolobado.pdf
    • http://lineampersandspace.com/uploads/1/3/0/8/130874282/pifazobel.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007335.bin
681c72e49017fff57d3c9bac6cbefae7f24591cb8e94e9d355c179f27704f1a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7335 8604 bytes
font_01_sfnt_off0000942f.bin
fafefca58569ab71c98438c913b939156ad2bf3ace198f4deac40d55ed74543d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x942F 1844 bytes

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