Malicious PDF — malware analysis report

Static analysis result for SHA-256 55755e5d10719b53…

MALICIOUS

PDF

68.8 KB Created: 2021-02-16 14:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d54854e277e062ded90001eaf57e1eea SHA-1: 76d77a66196ce664ebf3c317957aff06bddaac94 SHA-256: 55755e5d10719b539cbfdd9c4c6060261097d67b75d117d895c781c33eb02fc7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://jacksth.ru/strik?utm_term=digital+marketing+analyst+salary+uk PDF link annotation
    • http://coolmag.biz/bimibolulejerubukelopecxc5.pdfIn PDF document text
    • http://avtovishki-msk.ru/savita_bhabhi_all_episode_in_hindihlxjq.pdfIn PDF document text
    • http://verification-help.business/tower_defense_generals_td_mod_apklb3be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382413/normal_600303f9db4a0.pdfIn PDF document text
    • https://cdn.sqhk.co/kemivabesu/gjZhdgi/zombie_rider_crazy_racing_games.pdfIn PDF document text
    • http://lojasamericanasbr.com/asme_b36._10_freelt8sk.pdfIn PDF document text
    • http://mrshadow.net/548904488562bwuq.pdfIn PDF document text
    • http://cryogen.me/atheros_ar9271_linux_driverd4d9e.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/dkUZhKW/mirefix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_602421aae79eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388067/normal_5ff9e38e3e809.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kuboki/zugov.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/attributional_style_questionnaire_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/20_minute_guided_meditation_for_sleep.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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 5172 bytes
SHA-256: b2732d56bd37c12f4a7eafe6ce3dbe076486ac9b86b8111506e49d983fe10b03
font_01_sfnt_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 10420 bytes
SHA-256: 38439fc70b8d10ef14b5b7e8a30c4e05d442734b70548b8ab027d10df4e65253

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