Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb13c99dce03b84b…

MALICIOUS

PDF

75.4 KB Created: 2021-03-03 11:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 88e0c7843da665ac3518a4e4a4a4a8cf SHA-1: 4762ec683e6678b6e097497232f10c1b6aa179f0 SHA-256: fb13c99dce03b84b2d23827dfc7b8b6b1e36a8b7b95db84ea12ec7184fadffea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search terms, directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/award?keyword=bash+script+for+loop+files+in+directory PDF link annotation
    • http://zumewidife.mygamesonline.org/69894409281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_5fd96104e8cbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452845/normal_5fee12c42673d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_600ec057a6a8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485939/normal_6006172e176a6.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/what_is_the_ulysses_poem_about.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/bazadogenawabibipekemafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416512/normal_5fce10be17bcb.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/9984508.pdfIn PDF document text
    • http://jegotaraxipux.iblogger.org/subway_12_inch_chicken_breast_nutrition_facts.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/405924.pdfIn PDF document text
    • http://wubegewefek.iblogger.org/husqvarna_61_chainsaw_owners_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ninonasoligu.rf.gd/finding_net_force_worksheet_answers.pdfIn PDF document text
    • http://bususetut.epizy.com/90402071879.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/pudixivozegotikoturositu.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/sword_art_online_progressive_manga.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_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 5396 bytes
SHA-256: 31756344fe2a8c7517260f3b9838a00711ec14b95b10c0560e46f0c8858909a3
font_01_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 10796 bytes
SHA-256: d9872734b47a312e779945f8446fae8f25eacb7ad7b37c95a8e8cc3e5337fbe4

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