Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9df8f0265e8fbc…

MALICIOUS

PDF

72.4 KB Created: 2021-03-04 07:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 65dafc227dabf9d3e0764070f0cec65e SHA-1: a1d24b130b39193e674b0578a2afe0e76c0ab55a SHA-256: 9b9df8f0265e8fbcb1658eb3c30dd8787a4aa3346273b9400d31818de9f61eb5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to 'xezojetit.ru'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it as malicious with high confidence. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=how+to+program+a+chamberlain+953ev+remote PDF link annotation
    • https://xobopeta.weebly.com/uploads/1/3/0/7/130739243/wugamavisu_fofezi.pdfIn PDF document text
    • http://muldwych.com/what_is_criticism_in_bible_literatureekn1o.pdfIn PDF document text
    • http://trenketo.buzz/94101435685qwqxw.pdfIn PDF document text
    • https://jinimajaloxole.weebly.com/uploads/1/3/5/3/135314869/9017176.pdfIn PDF document text
    • http://spiritstudio.ru/905258922432mn21.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/ojjdjcb/92164070045.pdfIn PDF document text
    • http://power-guard.shop/sagipabizavokizizabojeru5zv1h.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/jjNjbAT/earth_day_art_activities_for_toddlers.pdfIn PDF document text
    • https://cdn.sqhk.co/romumoxoleno/jdghia4/26962273712.pdfIn PDF document text
    • https://tuzokoluxalof.weebly.com/uploads/1/3/1/3/131382257/regadozakezenoged.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/9cd3c3acbd157d2.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/47447250761.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/1218337.pdfIn PDF document text
    • http://kyukty68.xyz/movistar_peru_tv_aztecahivhe.pdfIn PDF document text
    • https://xifugewelude.weebly.com/uploads/1/3/4/3/134353264/153006.pdfIn PDF document text
    • http://fukikenikiru.22web.org/jawozelelo.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/Xkhdgeo/chocolate_dipped_strawberries_microwave_recipe.pdfIn PDF document text
    • https://lezekuzog.weebly.com/uploads/1/3/1/3/131378913/2295718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novezepif.rf.gd/pepateturujo.pdfIn PDF document text
    • http://gibopaxoga.epizy.com/wetavefoxotajujimixogal.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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 5868 bytes
SHA-256: e04b358b8fb03b4bd6e4e92c8c2d3e6885bb6dea5308325f503b0ae73ae47865
font_01_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 10032 bytes
SHA-256: 73e0249649e27b6308cc14e8c46f67b82fa0d00df0244812447bd6d8a1611db9

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