Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cdcbda7fb8d421…

MALICIOUS

PDF

99.4 KB Created: 2021-04-10 17:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0cf6a9e23049b736fdba54099eb83947 SHA-1: 493101828985f8f7863bd8b84496be9e5eeeaddd SHA-256: 38cdcbda7fb8d4210f1742147c177247265bfd5ed0d04043f5a97d597270ab82
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://resalured.ru/strik?utm_term=what+were+some+characteristics+of+northern+european+renaissance+paintings PDF link annotation
    • http://nikibolerobika.getenjoyment.net/comparison_of_adjectives_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/tipadasa/bhajgjj/summoner_heroes_tier_list.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/ULLjih3/88450901744.pdfIn PDF document text
    • https://rosotomana.weebly.com/uploads/1/3/4/5/134585450/393bfdae214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_602831c308dac.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/xuwawolewunumasu.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/JhbHxWe/capstone_library_tennessee.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/hghhid7/name_for_kik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5ff256ed88d6c.pdfIn PDF document text
    • https://zupawifotifawe.weebly.com/uploads/1/3/4/4/134480263/9674138.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/bhdjfe5/24951111744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_20423da80a4e4eea85180e9623a89ab8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/xezepen.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/is_the_original_bible_in_hebrew_or_greek.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/lekot.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/fb_video_er_pro_mod_apk.pdfIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_7f08d323fd254968bad11740104118d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/acrobat_pro_dc_update.pdfIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/kerujinusiwuzexoxowudesob.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_dc5521c5f9d34839abd843092a734e96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/niveles_de_prevencion_de_la_diabetes.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_off00014885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14885 5504 bytes
SHA-256: dbe762341678cfce13e6a609ff55a727afbe7037bb348a67d7308a70cd0e1c1f
font_01_sfnt_off00015b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B33 10592 bytes
SHA-256: 042665f91d63e4bfa92075f25041835677c88dd9441ee20673c52aec0dce9513

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