Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21bb03e2a9391e3…

MALICIOUS

PDF

94.0 KB Created: 2020-12-01 08:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8330cbf6976b81a46cc6e24234097d2b SHA-1: d31b7071d3fbbd55d1a3a58498f61f53ec134c35 SHA-256: d21bb03e2a9391e3b15940650c3446920f3b98532d397a288ff2e8a1c5a15124
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, contains references to 'Voice command calculator in python' and 'wkhtmltopdf', likely serving as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffset.ru/strik?utm_term=voice+command+calculator+in+python PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5f8ffae268fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_5fc167db89fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_5f9ec0aee61e5.pdfIn PDF document text
    • https://pevumufaropis.weebly.com/uploads/1/3/4/7/134706438/lopatiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_5fa568782378f.pdfIn PDF document text
    • https://lugemubijovige.weebly.com/uploads/1/3/4/8/134879604/9a4069f829c5d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f88a44b8ada1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd2b6ee1f2823a12053ffd/1606232949874/describing_motion_with_velocity-time_graphs_worksheet_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3836f81c9a2a0c6d7c25/1606301750905/principles_of_financial_accounting_homework_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b1c5239b0722913cd72f/t/5fc4c0806457125654d1921a/1606729858142/digimon_adventure_psp_full_english_patch_iso.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3ebb1972c46e3c6ad659/1606303419845/26078664731.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_off00013375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13375 5200 bytes
SHA-256: 79cdcb72d531378ef88561b63a1ed1d36a9f3405087c3830743ace6255ffa635
font_01_sfnt_off00014500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14500 11292 bytes
SHA-256: a8e2d12fb4435aceb28159657d8cb63858b02469cd495da7d2a749729211a7a8

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