Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53c7e90c72902a9…

MALICIOUS

PDF

80.8 KB Created: 2021-03-16 22:20:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 343d9795b72740417038fcdd26eaa2e2 SHA-1: 76d2b7a2f04c39b75aec61389aeaca0532f5e663 SHA-256: b53c7e90c72902a9e7eac8b7e67ef67386516fb46bde30b25d6f01985c65ecab
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs indicate an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=the+laptop+millionaire+pdf+free PDF link annotation
    • https://cdn.sqhk.co/pugirunosamo/jeANijg/disassembly_3d_demolition_apk_mod.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/9924292.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/Nie6jeL/60962201967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_6029d62a55c63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_5fe63e2b9a19e.pdfIn PDF document text
    • http://cafechorsu.ru/porokofedodalpun4x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_6049998f1fc78.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/guribanor.pdfIn PDF document text
    • https://cdn.sqhk.co/budafitanu/gc5gjji/4738375604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374703/normal_5ff01f0885c72.pdfIn PDF document text
    • http://kreativoblako.com/despite_although_worksheety0dgt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497697/normal_5ff45e15cc31a.pdfIn PDF document text
    • http://inmyshtangen.xyz/whirlpool_wfc7500vw2_diagnostic_modewcf5s.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/think_like_a_freak_chapter_3_summary.pdfIn PDF document text
    • http://usesol.xyz/afterlight_pro_apk_freeyihcq.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/calum_scott_video_songs.pdfIn PDF document text
    • https://bamopinusomuna.weebly.com/uploads/1/3/1/3/131379567/62cb8340c.pdfIn PDF document text
    • https://cdn.sqhk.co/gowozepugax/ijicTgd/canva_logo_maker_apk_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kajopulijus.epizy.com/annamalai_tamil_movie_songs_free_starmusiq.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_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 5052 bytes
SHA-256: e9c9f187e90a8ab240c15629bdc7178996dcff33b1a66d940db856221a45f1da
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 10904 bytes
SHA-256: 8146eaf267403d20942cdec03debfc56c77b2bb9f621740ab8f69b770e410568

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