Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d42e8da77997f5…

MALICIOUS

PDF

78.4 KB Created: 2021-04-11 18:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 106c72bab0c6cd7a54aafefb0f8dcea5 SHA-1: c9bacb760c62551a9579b71f0670212663bc4af6 SHA-256: f3d42e8da77997f5769df43be3d38a0741a38dd97b596bf59a1b510f7e2ff301
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=what+are+some+good+hobby+ideas PDF link annotation
    • https://nosavarugogitov.weebly.com/uploads/1/3/4/4/134488680/6edf0f629d8984.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/sifisu_nonagubamezaxe_sixub.pdfIn PDF document text
    • https://zuwuwuxi.weebly.com/uploads/1/3/4/8/134883554/lumeludevixowad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5fd860bddbe6e.pdfIn PDF document text
    • https://fenolipemul.weebly.com/uploads/1/3/4/3/134341818/xakalaxanujuzaxujo.pdfIn PDF document text
    • https://fubapora.weebly.com/uploads/1/3/4/8/134897301/2787602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_5fd35123574ad.pdfIn PDF document text
    • https://ruvesupiranaduk.weebly.com/uploads/1/3/5/3/135314660/8052006.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/walirufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_60526c97b26a6.pdfIn PDF document text
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/rabesumeloxelu.pdfIn PDF document text
    • https://zabosete.weebly.com/uploads/1/3/1/1/131164473/zovovigi.pdfIn PDF document text
    • https://volexerakonoza.weebly.com/uploads/1/3/4/7/134713377/tijavanepusuwuza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497370/normal_5ff790fede55c.pdfIn PDF document text
    • https://pimizotola.weebly.com/uploads/1/3/4/7/134770615/9bee42dfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469365/normal_5fe18936258fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_8b95eb542d694aed936713f850698b4a.pdf?index=trueIn PDF document text
    • http://zabojalujetilun.rf.gd/diabetes_mellitus_type_2_guidelines.pdfIn PDF document text
    • http://vofabij.epizy.com/internal_auditor_resume_template.pdfIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_64c2d695de16421b841c4f4086869ae6.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_cd65528faa704f6aa781d7caad946273.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_b1f7651b56df4aa2a24ee3e204fee4c3.pdf?index=trueIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_f91d0048b4ea4c42b5c00fa339318036.pdf?index=trueIn PDF document text
    • http://wixudilasajigil.rf.gd/70785984677.pdfIn 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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 5460 bytes
SHA-256: 661dd675c016cf1da1cfac14faac8a3fb2a2517bcdd78088190d9a6307907c7c
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 10980 bytes
SHA-256: 9ff20825db619c3d2bd49b0f067a954ac5a120df2c84dfc0a3a16a2f7b0bc6af