Malicious PDF — malware analysis report

Static analysis result for SHA-256 33160c86c54cef7f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-28 23:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3a1e9a992895b1011a1551949bb20c8 SHA-1: 8887c93c6e9df470fb929428fd747db3b7b7337a SHA-256: 33160c86c54cef7f5abda782cc03c93997f26d57f8b3e0a6af172bb21dd4a9e4
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. ML classification and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://xezojetit.ru/wix?keyword=pathfinder+2e+mind+flayer
    • https://cdn.sqhk.co/konajera/Vidjehf/skyward_login_gisd.pdf
    • http://fuzubijixulux.mygamesonline.org/voluputeluwuzapegimejufen.pdf
    • http://indonesia2health.online/983014829392f727.pdf
    • http://classicalnaturally.com/gensel_saylar_dizisi_forml3e79w.pdf
    • https://cdn.sqhk.co/dakizenewa/DItjehe/dark_side_of_the_moon_vinyl_poster.pdf
    • http://metalllift.ru/3845541874348zww.pdf
    • http://ritixibetono.mygamesonline.org/adhyathma_ramayanam.pdf
    • https://cdn-cms.f-static.net/uploads/4492275/normal_6050f6130121a.pdf
    • https://static.s123-cdn-static.com/uploads/4479933/normal_5ffaa13a429b7.pdf
    • https://cdn.sqhk.co/gobajejuz/bifZyt1/pubamavusejexejirexad.pdf
    • http://marketitaly.info/ar_rahman_surah_in_teluguuv5t1.pdf
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5fc77bb3b6b30.pdf
    • http://bioforce-co.site/ruzirepukojilalvbcx9.pdf
    • https://cdn-cms.f-static.net/uploads/4370541/normal_602ea93192175.pdf
    • https://static.s123-cdn-static.com/uploads/4369922/normal_5fe3b33d2a4a2.pdf
    • http://davorivugexawu.sportsontheweb.net/7666282393.pdf
    • https://cdn-cms.f-static.net/uploads/4424933/normal_6033b42134883.pdf
    • https://cdn-cms.f-static.net/uploads/4380072/normal_5fd8b95abaa9a.pdf
    • http://bilkaita.space/96466853769lsrah.pdf
    • http://3-bureaureport.info/the_luck_factor_brian_tracymv5fx.pdf
    • http://repair-kvadrokopterov.ru/asrock_z97_extreme6_error_code_99ryr32.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bexovivuvere.myartsonline.com/kobowa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b5.bin
4c3be452a828e1c1f0deea9fbb5942de5be365ac9586e8211d4f192cc768d0f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 4884 bytes
font_01_sfnt_off0000f210.bin
22f2afa49ec97f39b49426ffbc62903b24f92afeaece37137cb6ca28b1b9e845		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 11388 bytes
font_02_sfnt_off00011826.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 4324 bytes

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