Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bf10880231c6b7…

MALICIOUS

PDF

100.7 KB Created: 2020-12-17 09:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1fe5c31392b0a5782a83568856d5649c SHA-1: 97eb9ff0fca8f9579fda22aa6fbb6d3689031ea1 SHA-256: 05bf10880231c6b7d02f529a272e7a7bc1efe4e9fa97583c950ef99fd97b2685
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=definicion+de+evaluacion+de+desempe%25C3%25B1o PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5fce502de3df3.pdfIn PDF document text
    • https://lijasefevofik.weebly.com/uploads/1/3/4/8/134889997/f8470352b6.pdfIn PDF document text
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/3758051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377114/normal_5fbade07d42ac.pdfIn PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/b94bb.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/fiziba-kedagesabixid.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/zugomede.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/soraturove.pdfIn PDF document text
    • https://xexewajadet.weebly.com/uploads/1/3/4/6/134651298/6119400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5f90e59cd58c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tuxutedi/story_saver__android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBE 5280 bytes
SHA-256: 42e5dfe9084b5bff9e88ffd9ac3c6956a382de4adc08a39db000b867ba592262
font_01_sfnt_off00014e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5B 12000 bytes
SHA-256: f6509bc004ab132cf2f173fec2ca74761c942f6e164802db90c63af15b209b07
font_02_sfnt_off00017562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17562 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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