Malicious PDF — malware analysis report

Static analysis result for SHA-256 83abdab8b15447d4…

MALICIOUS

PDF

78.6 KB Created: 2021-04-10 00:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0fa254fa684d0e51490b0d51101ff850 SHA-1: c7e56f4d4e52c77a6994d709c8bd686b742973a1 SHA-256: 83abdab8b15447d4aa9cda3a4d0ff538efb7147752b9bd2cf8097b3909f65d45
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. The embedded URLs and the PDF structure are consistent with a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=where+is+book+of+enoch+in+bible PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494674/normal_5ff90cd9a0112.pdfIn PDF document text
    • http://xolidila.iblogger.org/bpe_full_form_in_management.pdfIn PDF document text
    • https://wenewemegidipep.weebly.com/uploads/1/3/4/6/134679414/lifapazoxesunotesek.pdfIn PDF document text
    • https://nagalijas.weebly.com/uploads/1/3/1/3/131398542/lidiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/f7W4gfr/warriors_orochi_3_characters_unlock_list.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/jhzhhDH/xiderunezarikazed.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobigawe/hhdWhjt/argos_wityu_annual_report.pdfIn PDF document text
    • https://bekitatabegoze.weebly.com/uploads/1/3/0/7/130775701/9044998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_606445a8d715e.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirurafixi/iipjb6X/checkers_menu_calories.pdfIn PDF document text
    • https://wunapeno.weebly.com/uploads/1/3/4/6/134621426/4078243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_6010024d49261.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/pomizedojogujawipuv.pdfIn PDF document text
    • https://tufuziboserivu.weebly.com/uploads/1/3/1/6/131636644/e44fbf6b.pdfIn PDF document text
    • https://xofiwilo.weebly.com/uploads/1/3/1/4/131453946/96e758edb9894a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vopodopo.rf.gd/pezuporupeti.pdfIn PDF document text
    • http://lanelebitomutes.epizy.com/bootstrap_form_button_width.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_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 4976 bytes
SHA-256: 32544fc4678f221365fae21dafbe1b1065a5427d511b4c582d6aa7ee364ce016
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 11004 bytes
SHA-256: 560678ece38ee1175226e2a7b013435006a3ef819cb1e8f02ecae0e34d57818e

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