Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f4946103441917…

MALICIOUS

PDF

73.4 KB Created: 2021-06-02 07:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dde99f7ebabef3236703e7eaa4ed1021 SHA-1: 8105ab0068280135379f697c14f3dcd1168bfea0 SHA-256: 43f494610344191763f1b3e0686f19fb233eff6ce761e3012bad62adbb8a8e11
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous external links, many hosted on disposable domains, to lure users towards potentially harmful content. The document body, though heavily obfuscated, contains references to software downloads and cracks, suggesting a social engineering tactic to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/pbw?utm_term=corel+draw+x7+free+download+full+version+with+crack+zip+file PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471985/normal_5ff804a159735.pdfIn PDF document text
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/2116010.pdfIn PDF document text
    • https://rabibusapufatov.weebly.com/uploads/1/3/5/3/135301207/rumaliburifano_judovawuwo_topilokixosupa.pdfIn PDF document text
    • https://xikefopu.weebly.com/uploads/1/3/4/7/134748362/vopitawa_nubiz_polelufuwapom_fijax.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/8d6d7dc6fae5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421943/normal_5ff66fd6541d9.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/61eaba.pdfIn PDF document text
    • https://vijativu.weebly.com/uploads/1/3/4/5/134597759/pujimoxoj-xabutogelepeti-retekefazutip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_603eab858fa06.pdfIn PDF document text
    • https://tuvuneboginat.weebly.com/uploads/1/3/1/6/131606819/bizojuzopoxoti_xitijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478683/normal_605a7c4416b0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_604a60b0a78c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_601a5a9b94242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5ff66d8339142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_60641d3edaf44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475383/normal_5fd0841a51627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_604d7f04b2857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_605303a19f6bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0924699-ed95-4645-93b2-239ad7ac0960/36803719143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70701421-b96e-417d-9ac6-25f1ac0b07c9/lubuzoguroresoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80f0272-68b0-4823-b986-5b0dd15a2fa4/puvapovesotedazuzufizazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837959d7-884b-4e0e-a33f-f25734247be8/what_does_the_code_5d_mean_on_a_whirlpool_cabrio_washer.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_off0000e03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 5564 bytes
SHA-256: c2e256fef3e3427c912f7e11fd979110ed0fca750c3ecee174155c55fa6765be
font_01_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 10660 bytes
SHA-256: 0ccc0ed2037200e3d92f193ca8322fd291abfbc192a9867616ed48cb0ee26160