Malicious PDF — malware analysis report

Static analysis result for SHA-256 50634a568ae28ae7…

MALICIOUS

PDF

79.2 KB Created: 2021-01-06 07:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c2e6ad74c3ea94e27a3c881ce8024432 SHA-1: 8a9966ff473bccc585e3c6953a54c488c811baf7 SHA-256: 50634a568ae28ae75c5247d5fe7bb4fd33f96f4ff26ac5e0eb40377876d531cb
154 Risk Score

Malware Insights

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

The PDF file contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://traffking.ru/123?utm_term=nervous+system+flow+chart'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of malicious URLs within the document body suggests an attempt to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffking.ru/123?utm_term=nervous+system+flow+chart In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f8a013a03daf.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/aig7jeq/8_ball_pool_rules_ball_in_hand.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_5fd88b10958bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487186/normal_5fee6649c4ef8.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/gogoxowiniza/academia_brasil_performance_alfenas.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/wexikulewenur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a383b10c-056e-4f25-9691-68c91bf90a94/tekken_2_apk_mod_download.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/vicidial_manager_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/sutajigebilibawobuvima.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/najekowavirosaveruvamu.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/questions_and_answers_bible_study_lessons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdcd922-b4be-463f-970e-eed024d1a439/46495341469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2856f337-70ed-45dd-8d35-485d2214a4ae/rujipesagisalu.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_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 5344 bytes
SHA-256: 647b3e4a97bc68d911d1de6a7c2ba5076e276eb19d9bb51b3224673b5c1810a7
font_01_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 10196 bytes
SHA-256: 597ffb886ef096eefbb6a2c0623c9bcdfe1591cdc494c0cd824bf038efdffaaf

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