Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b68534f2b3a4c84…

MALICIOUS

PDF

39.2 KB Created: 2020-04-11 11:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14f6f328b3dee8598a7a4efacb12f73e SHA-1: 22e896be10397d330c2821be0f824da15526e45d SHA-256: 5b68534f2b3a4c846cbf0a56a2e8d26779461a4f37f01cc13f7054fc09aa6dd6
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are highly suspicious.

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://74-123-77-221.mgwnet.com/uploads/1/3/0/6/130622027/130622027.html#seeing+annie+dillard
    • http://birthwitnessemilymarie.com/uploads/1/3/0/6/130640227/tujekowememoxat-zodolapova-tidalozubuwi.pdf
    • http://getrouwdepriesters.org/uploads/1/3/1/0/131070220/969255.pdf
    • http://seafoxsailing.com/uploads/1/3/1/3/131379956/riwiga.pdf
    • http://equalbalance.org/uploads/1/3/0/7/130740256/3db5a1c967ba22.pdf
    • http://aprginc.com/uploads/1/3/0/7/130776667/043b5.pdf
    • http://bgrand-apparel.com/uploads/1/3/0/9/130969212/senabovuxozag.pdf
    • http://3greenhats.com/uploads/1/3/0/5/130539035/d3592.pdf
    • http://elevationsenior.com/uploads/1/3/0/6/130620515/566369.pdf
    • http://warenoptometry.net/uploads/1/3/1/3/131378915/bupetezodamig_xulojuzowobulu_kuwagofo_xipawawi.pdf
    • http://merkabamind.com/uploads/1/3/0/9/130969476/3274007.pdf
    • http://sixteen20.com/uploads/1/3/1/4/131407307/lovoweguvunalu-zevabafagomoba-nujiwowerokasi.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_off000071cd.bin
c60173622925edd5e9a4c61d07cf4e31b2838f1e5f57d9773ae74a8261d6bc9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CD 7668 bytes

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