Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac6bf994720ebac…

MALICIOUS

PDF

85.1 KB Created: 2021-02-10 14:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 72e768117a59e0142ea852a220a5be06 SHA-1: c20f9ca69d832553191dd0610b93bdcf75768dab SHA-256: 6ac6bf994720ebacb24c9af0e13337084b6f55f6a8d301d3e5c71b1c19def53f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to lead users to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/123?utm_term=carmax+return+policy+with+trade+in PDF link annotation
    • http://winwites.space/roberts_rules_of_order_10th_editionil7mq.pdfIn PDF document text
    • https://wezefumuge.weebly.com/uploads/1/3/4/6/134614004/8663d38fc4f.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/hihhDrr/best_laptop_deals_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/GhcV1kV/trending_instagram_hashtags_october_2019.pdfIn PDF document text
    • http://com-signto5.xyz/pupajunevetoduf1p3go.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/ijhjybM/drug_lord_2_full_movie_online.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/4333295.pdfIn PDF document text
    • https://cdn.sqhk.co/kilatelazobe/qs8hdhg/58969303663.pdfIn PDF document text
    • http://vykupavto54.ru/conectores_de_consecuencia_en_ingles7n17l.pdfIn PDF document text
    • http://vodoroding.info/ascentric_platform_servicesj37ko.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/ya6jhnm/supafudilaz.pdfIn PDF document text
    • https://cdn.sqhk.co/noxavuris/gekUwQb/rusk_deep_shine_conditioner.pdfIn PDF document text
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/lamobuzuje-xikalapenukux.pdfIn PDF document text
    • http://help-nanny.site/46978223384vmbxo.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/mizeganita-zezewevus-dedivadifus-daxita.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/c2fe23d.pdfIn PDF document text
    • https://depewezuluro.weebly.com/uploads/1/3/4/1/134108544/d791ef702a.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/7925667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 5304 bytes
SHA-256: db94f9ec6b75e356eaa657cb44e55147aa1943fd54e2947e34262b06b2881111
font_01_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 11316 bytes
SHA-256: e648fd26ece47613d8cb71a0ea6a74deef55d367a4bce07be4095b600135337d

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