Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa50fd36f72dc2b4…

MALICIOUS

PDF

72.0 KB Created: 2021-01-07 02:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a672c067f4c3e46f9263d585a2d1a714 SHA-1: c492a0d1bff1aa1a9ea94f490bbcc0294950c46e SHA-256: fa50fd36f72dc2b48f71c6030dc52fe5f91f7448420c12adca8bf2289666d5e5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to distribute or link to multiple potentially harmful documents.

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://trafftec.ru/123?utm_term=long+beach+auto+auction+public+sale PDF link annotation
    • https://rilodogalaru.weebly.com/uploads/1/3/4/3/134398508/wurupojegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_5fda1135ae4bb.pdfIn PDF document text
    • https://nekekijubexofus.weebly.com/uploads/1/3/4/5/134587401/lojapozixosiziku.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/7098c8b9-2ecd-4364-a82b-faa1c8fc8bde/kobez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824193fa-d42e-4da8-9c4f-cd122f0e95db/rock_climbing_free_3d_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c87089-4b87-41d0-9730-8e86590b8b9f/fish_hunter_shooting_diary_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16ef67d-3232-4572-97ef-3781c84cfc9e/48436682524.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/46278968787.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/hardy_weinberg_practice_problems_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/addiction_by_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec38b19-40e0-40be-b644-2b60378e5cb4/zibupinagefa.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/4787544296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe02765d-2cc7-457f-bfdd-5f645fd11512/extreme_driving_simulator_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642dcd1c-b7ed-4680-9292-7921a75d071c/xorosimotapopapobet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09762fa-a93c-4864-8448-528cf571d840/429428783.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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 5180 bytes
SHA-256: 5b241ac76889140e3efa42a5a04d2b86eaa9f6c972fc807c173302d75f527547
font_01_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 10928 bytes
SHA-256: f39b307c80e259cf4439d5f0664072a31a4155dfff220d2009138e076978ac0a

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