Malicious PDF — malware analysis report

Static analysis result for SHA-256 296d0fb0244f1165…

MALICIOUS

PDF

76.7 KB Created: 2021-01-09 11:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a16084a79300ba5673b74fe16f03b540 SHA-1: 7b1177920f8a59c369c64d682c3ab31c63244850 SHA-256: 296d0fb0244f11651b74967b534ebcb98e61434caea5afa7b02bc039a11275db
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to other PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or distributing further malware. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or content distribution scheme.

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://trafftec.ru/123?utm_term=properties+of+definite+integrals+pdf PDF link annotation
    • https://pemifapizu.weebly.com/uploads/1/3/0/7/130776061/3307800.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/575867.pdfIn PDF document text
    • https://cdn.sqhk.co/tidaxetosi/rvhjheP/western_mangalsutra_designs.pdfIn PDF document text
    • https://fufopijubotuxo.weebly.com/uploads/1/3/1/3/131381544/7e72cf9caac.pdfIn PDF document text
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/8276316.pdfIn PDF document text
    • https://repumuwijuruto.weebly.com/uploads/1/3/4/4/134469056/220803e6b93.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/cGxiijh/nuzajazuvija.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/9323825.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/cl1Lcgf/vex_4_kizi.pdfIn PDF document text
    • https://vamepuruzaf.weebly.com/uploads/1/3/4/3/134352512/7084d845a852.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/kokesatodixon/romutosil.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/34590021121.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_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 5212 bytes
SHA-256: 66e0dcd169c87ce99ebf385c729ea0eaa97c3b5cbb5bcd0bf16fd59d380bc59e
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 11720 bytes
SHA-256: 951fa7e663235312b30d62d7e9a3e92e3a627104e917e5574fe0b42b4009c573

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