Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f255c86d90acaf4…

MALICIOUS

PDF

70.3 KB Created: 2021-01-03 21:33:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a376ee414a2acc30910fc33ee8a1667e SHA-1: eb7b0df10710fc2b6d50fd4bbbed254758ea19dc SHA-256: 3f255c86d90acaf44e46f24d26feb3577de32a07f468ce4d889fd6283431b11e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a significant number of external links, with one pointing to 'traffking.ru', suggesting a link farm or redirection mechanism. The document body is heavily obfuscated, but the presence of numerous external links and the 'PDF_SEO_LINK_FARM' heuristic strongly suggest an attempt to manipulate search results or redirect users to malicious sites.

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 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://traffking.ru/123?utm_term=lake+county+ohio+voting+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472766/normal_5fe60f85717d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5fc24d0991ba2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fc71c56ebd9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_5fd25aa391160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5fa4a66d0979e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456140/normal_5fbb1a11e998c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500446/normal_5fee2b85b1785.pdfIn PDF document text
    • https://zirenujunez.weebly.com/uploads/1/3/4/4/134431605/1a482.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/8960dadb-6037-455f-8b62-e757ffd171f6/wolfson_and_pasachoff_physics_with_modern_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99fe0924-c801-4a9b-bb49-836d50d9be60/57859232070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ed3500-4751-4a3f-baa4-8a941c82b4dc/posigidabimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84da7b49-f38d-4fc2-8150-326dd8b078d8/28970344987.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/ioof_news_reports.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_off0000d47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 5064 bytes
SHA-256: 68bcb13551f31ec24157644644bc093b62767b9ec86b1806e209675afff6266f
font_01_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 10868 bytes
SHA-256: 84d7308ce81ca3371aed065f297f519ed4b2e7fd9c420f96cf6be2b083d9b02c

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