Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dce95f71fcc89f0…

MALICIOUS

PDF

66.5 KB Created: 2021-01-14 06:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20e15455a83fa4675cf9103d31c91dbf SHA-1: 6535249253b44f823d2004e21ac955b821a4bbdb SHA-256: 3dce95f71fcc89f0c6e42a486bb7e7c196039b2bc85ba2991e0f6348fbe90f36
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=branden+jacobs-jenkins+instagram
    • https://static.s123-cdn-static.com/uploads/4380090/normal_5ff68ba276025.pdf
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/gugupixopekaxi-xazugoduv-safilewafiwuku.pdf
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5f8d0d9f91944.pdf
    • https://mulafixi.weebly.com/uploads/1/3/4/3/134317856/xadid-jadinuxukilaj.pdf
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5fa0b067a259b.pdf
    • https://cdn-cms.f-static.net/uploads/4481516/normal_5fb521192b844.pdf
    • https://cdn.sqhk.co/pixafosabow/eLjgUYT/40184802960.pdf
    • https://cdn.sqhk.co/seworani/cjirywB/stick_war_legacy_gameplay.pdf
    • https://cdn.sqhk.co/kupawusel/8Pjd9UF/rewaluvegalazetomivuteg.pdf
    • https://site-1175238.mozfiles.com/files/1175238/98125094427.pdf
    • https://cdn-cms.f-static.net/uploads/4445573/normal_5fa957a8ece16.pdf
    • https://cdn.sqhk.co/vizebika/gf6ijRq/microsoft_teams_meeting_options_mute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000c823.bin
98370dcdd52b5b308af43f88253a3abd61dbeeab7a813b001eeef97f5fd46a65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 5588 bytes
font_01_sfnt_off0000db1f.bin
eb7cf7c359d85ccdf6298fd98061675c26df08505fe1dcb23b664680625bd1d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1F 10048 bytes

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