Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cc4ad40ed387b9…

MALICIOUS

PDF

72.7 KB Created: 2021-03-28 06:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c24d1a209bcf0c846a856cdb6e51c401 SHA-1: 85fd5bf106dd0b10b09aca098b9a905896548324 SHA-256: 65cc4ad40ed387b9b656ed8eb6f50214d5eba637cdb69eb78f27a9d9a1cfd082
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, not a typical user document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://jumiwimov.ru/award?keyword=livre+orthographe+pour+les+nuls+pdf PDF link annotation
    • https://gedibixofesona.weebly.com/uploads/1/3/4/6/134688069/34a9049c.pdfIn PDF document text
    • https://fikozipe.weebly.com/uploads/1/3/4/8/134887908/7c36660cd948a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375093/normal_6002d1813944e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391907/normal_5ff4c9553ff5c.pdfIn PDF document text
    • http://hempmap.ru/what_is_nautical_knot13jum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_60422063a87ac.pdfIn PDF document text
    • http://mivifukatovaga.getenjoyment.net/gejopivene.pdfIn PDF document text
    • http://maska-respirator.com/karodabakezibit42a36.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/99503351644.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/belgium_metro_map.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/nulosaw-vovevosokinike-suragugizuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5fe133063fbdc.pdfIn PDF document text
    • http://zespodsvetkoy.site/887279943235or5l.pdfIn PDF document text
    • http://waliduv.mypressonline.com/motifed.pdfIn PDF document text
    • http://mx50off.pro/419539021969ko0q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_602a81c5e9ad8.pdfIn PDF document text
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/6507641.pdfIn PDF document text
    • https://zebomutob.weebly.com/uploads/1/3/2/6/132696512/9cde4f07.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/29d5a681f.pdfIn PDF document text
    • http://tekupugu.sportsontheweb.net/styles_of_leadership_in_education.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_56ecb7b048f44bf5b378de9d64730c4f.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_f411841dafed435693b1b1217eb66d13.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_0198fc848ee74fb5b21972f47890e9ea.pdf?index=trueIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_cc6baee26dfa4775b65928e2b932e8f6.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 5304 bytes
SHA-256: 641c446da940314c9a9ce4b63a2ffb9e7aeff5b6bb9ed2e3e72406109969de7b
font_01_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 12120 bytes
SHA-256: c9571510db2deb5638c6cf9b502289fe897f2ea70f796d6665dcd45d6d04e4af