Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80defd4c24234df…

MALICIOUS

PDF

76.0 KB Created: 2021-04-15 04:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e90dbcacda08f8b9362798d60bcd2516 SHA-1: b0f4849d07e18e53ae058cc810772b7f337c58e3 SHA-256: d80defd4c24234df5216ad0d702020edae879025a9a756b9f5c52903fc712762
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a significant number of external links, indicating a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=celf+5+examiner%2527s+manual+pdf
    • https://jaxobowes.weebly.com/uploads/1/3/4/5/134591409/1682643.pdf
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/laron.pdf
    • https://sinonulu.weebly.com/uploads/1/3/4/6/134654736/lupukawisume-fugujiragef-tamebizexod.pdf
    • https://cdn.sqhk.co/wemitupu/7gfieje/driving_school_2016_mod_apk_hack_ios.pdf
    • https://leruvipox.weebly.com/uploads/1/3/5/3/135347136/ce571dffa875.pdf
    • http://fajujefa.getenjoyment.net/15240768199.pdf
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/nodot_bopadimugoxude.pdf
    • https://cdn.sqhk.co/fazovivum/1tijzEu/somudovejo.pdf
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/6523045.pdf
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/fowomufi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mejifavo/logic_problems_weekly_cafeteria_specials_answers.pdf
    • https://s3.amazonaws.com/gifiz/kafavuvuvuva.pdf
    • http://vuzonulegi.rf.gd/banking_and_financial_awareness_gradeup.pdf
    • http://vuvazapej.rf.gd/wording_for_wedding_invitations_templates.pdf
    • http://bixejefasi.epizy.com/32006442665.pdf
    • http://fowimifefezujo.myartsonline.com/88303585659.pdf
    • https://s3.amazonaws.com/xanunafojuloki/24766621162.pdf
    • http://nagikesedogoru.rf.gd/xodajukiz.pdf
    • https://s3.amazonaws.com/toliwudalamem/8th_grade_math_minutes_answer_key.pdf
    • https://s3.amazonaws.com/popisiburewixuj/nexupulixuzerakewujokar.pdf
    • http://bufalirafuma.epizy.com/do_bounce_dryer_sheets_keep_bedbugs_away.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_off0000e9f4.bin
1dfa4a34e9756d9fa00e27bd91b6bc62f5622f0cba5d7890d6c2742aac9e3846		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 5320 bytes
font_01_sfnt_off0000fc02.bin
07c69aa825e57664709b7a955099424bc7a619294617109361088cfe43d4dc76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 11384 bytes

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