Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d85533ac72e581…

MALICIOUS

PDF

66.0 KB Created: 2020-11-13 17:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4aa032ac2a7bbaa4951300f201cbe300 SHA-1: b7cf32ab6cf7b37f1f4bcec4491dccfca3e8a2e1 SHA-256: 42d85533ac72e5814f175d5c814fc85b0cf4cea3fd85f26235a95ae851bebe49
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is https://trafffi.ru/strik?utm_term=dashiell+quinn+smith, which is likely used to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://trafffi.ru/strik?utm_term=dashiell+quinn+smith PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5fa7fca9b869f.pdfIn PDF document text
    • https://pugerazetowed.weebly.com/uploads/1/3/4/3/134341851/9329728.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/13acc031-c020-4d95-a473-a95f561e6d99/kutanero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc5b60b-e029-4159-8c46-e8c0a3748f3e/sanoteripuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63192fd7-8320-46fa-9092-3839df77aa89/xogifojufezos.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/calisthenics_home_workout_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/pdf_antropologia_uma_introduo.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/36632309931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e0bbb6-a7b4-40ba-8f82-cecf63e8eab6/chase_close_joint_checking_account.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_off0000c517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC517 4956 bytes
SHA-256: b5368ca417d3fe7151a47a0ea2e5afb17e71e1114cbde1f80324d11bc826fc97
font_01_sfnt_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 11648 bytes
SHA-256: fecfbdaaae1c9e0205de19798926e88417d8e427ffd3dcfa6592a996456eb51b