Malicious PDF — malware analysis report

Static analysis result for SHA-256 426d73ccbe0f397b…

MALICIOUS

PDF

73.1 KB Created: 2020-12-21 17:22:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: da9b68b2dd094b6239cbf749a3b574a4 SHA-1: 038e555eba410a18ee4faf70ba7f4f2f97052d27 SHA-256: 426d73ccbe0f397b9dbe2fcfe39ddfed207f96f59ef1c8752d876331c906e509
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that likely serves as a lure for phishing or malware distribution. The heuristic indicating a security bypass instruction is a strong indicator of malicious intent, suggesting the document aims to compromise the user's system by disabling protective measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/123?utm_term=viper+479v+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5fc8bf28e58b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5f8e0cac983cd.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/fff624ad-5c55-4317-bf3f-93820bf99d2c/damabuliles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32494d35-a0a3-464f-8dca-81da94693f3a/5977708759.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/retonulagasatakopabavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7c8406-4f98-4ad6-a8c0-a961022e27c2/dark_knight_gearing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90657bd-fe05-49fb-bf14-83b65be09d76/quadrilateral_area_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de8ceeb-f6f6-4023-b605-2b2cc58ca5b4/probabilits_conditionnelles_exercices_corrigs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8cff18-c115-43fb-8e3d-3068923f7ef2/zinezorotodizunugopak.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2979f7848ba205d236332/t/5fcc76ee2bc7884852ad7aed/1607235311385/2_player_racing_games_xbox_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a979b2-55da-4efa-85f2-96638c803d8f/51561704597.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/lab_safety_rules_crossword_puzzle_answers.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_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 5356 bytes
SHA-256: 6a3d7a8749e316b008712ded584a520586b2c448b1979ca6ca17ffe3ddee0c26
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 10600 bytes
SHA-256: 1d15cb57397f2b36f0f291aeeb7be213ad3637a1f6c02dc7377a3a8eac6d381c

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