Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadc8e4e53bba9ec…

MALICIOUS

PDF

69.8 KB Created: 2021-02-15 20:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 48bf4da3d6b479e2bc617fe0e31c1290 SHA-1: 5798a1c3b2372c2d66497584c0bb4e150ebe3551 SHA-256: cadc8e4e53bba9ec54746d815bc3fb9f185c958836d840aae2e034cae06a3618
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specific URL, 'https://leonvi.ru/strik?utm_term=2000+ford+ranger+4x4+wheel+bolt+pattern', is directly associated with the malicious classification. The presence of external URIs and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=2000+ford+ranger+4x4+wheel+bolt+pattern PDF link annotation
    • https://cdn.sqhk.co/wepiwojeta/jmwFjfz/99._5_the_wolf_contest_phone_number.pdfIn PDF document text
    • http://getyourscore.info/tonesusuzefitefewapodamiptsv4j.pdfIn PDF document text
    • http://nely.xyz/kohler_generator_service_manualsoqapb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366987/normal_5ff3d9849936b.pdfIn PDF document text
    • http://slmit.space/16321680340yscen.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/108c03fac0988f.pdfIn PDF document text
    • http://zabavnyi-slon.ru/727838520427a9m6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_60068f5166629.pdfIn PDF document text
    • http://vodoroding.info/ruruzekutasuta08stg.pdfIn PDF document text
    • http://1fps.ru/22594467401p8yj9.pdfIn PDF document text
    • http://zupuvotan.22web.org/ancestral_quest_14.pdfIn PDF document text
    • http://eglo.club/jimevidarazijo81wkf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vojemigami.rf.gd/29227898951.pdfIn PDF document text
    • http://fubolorira.epizy.com/jezuramal.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_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 5692 bytes
SHA-256: 55e8d75709ce2b78635e0fcd7eff35470b850182aedb7c9a26f20980d093d2ee
font_01_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 10592 bytes
SHA-256: efea91a75b0536ebc34d86c181e99e914ccbb2645e9714ff6fbac80ab9339ca4

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