Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4a914f276c650a…

MALICIOUS

PDF

70.8 KB Created: 2020-11-30 13:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abb6ad2583adfc3b2dd0d61ad384e2de SHA-1: 1ea3ead0409bfa073e88d8c9542a73e694137642 SHA-256: ff4a914f276c650afb223d29e142ed6a8814508e5be5ddd8c00482b9e83f8193
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document employs a social-engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to facilitate credential theft or malware installation. The presence of numerous external links, including one to 'trafffe.ru', suggests it may be part of a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffe.ru/aws?utm_term=poweredge+r710+idrac+firmware
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/9067863.pdf
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5f9affa023f32.pdf
    • https://sezemizom.weebly.com/uploads/1/3/4/6/134622585/4285944.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd19809eac5d50e5691461/1606228352931/a_dogs_journey_book_reading_level.pdf
    • https://uploads.strikinglycdn.com/files/60e57f4a-f363-4781-9524-4054c420c721/rockstar_full_hd_movie_1080p_filmyw.pdf
    • https://uploads.strikinglycdn.com/files/da51681a-8eaf-4e5f-b3f4-8ff8b537cc0d/17680228654.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd2873493e9e2166fa49c3/1606232179813/79173446427.pdf
    • https://uploads.strikinglycdn.com/files/4f32007e-97a2-44e6-b83e-72c104f6c2e7/wagepapugus.pdf
    • https://uploads.strikinglycdn.com/files/6c9c0b90-1ed2-46f7-83ce-cc48919f5c6a/fojikimarabut.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf512b4c4d833b8bcda1d/1606219029061/most_catholic_king.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf61ed7acac6192ab8b851/1606377969245/convert_torr_to_atm_calculator.pdf
    • https://uploads.strikinglycdn.com/files/1402b75e-49ec-4ad8-9253-393f9f4d6238/matrices_basics_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/ba55bdf4-c103-4325-a54d-710166699fcd/34879887863.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4dd.bin
e19623796c6b344b35c015ddb9365e25e35421934167d35339868dfbb017dcc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 5496 bytes
font_01_sfnt_off0000e7a0.bin
3608b7ad1ec7c8a9f5c109882aa4e9b9363872fa83d691aedede4563c8118afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 11408 bytes

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