Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19e58190c52a88e…

MALICIOUS

PDF

76.7 KB Created: 2021-03-16 06:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 677867fbfa8e1a3a0aea6f563c3078d8 SHA-1: bbd57289f308bf55ebfc28328f8428522a01ceb0 SHA-256: c19e58190c52a88efbbc5190dd626f2de81a4873162282f8e543e2156a39cb4f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, specifically identified as a 'PDF link farm', suggests an attempt to direct users to potentially malicious websites. One of the extracted URLs, 'https://zajinet.ru/strik?utm_term=pioneer+202+bounty+hunter', is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=pioneer+202+bounty+hunter
    • https://cdn.sqhk.co/gebemiwisero/FgjICju/virtual_dj_mixer_software_for_pc.pdf
    • https://cdn.sqhk.co/ninulekuto/al4jjhb/carpet_cleaner_vacuum_rental.pdf
    • https://xonamova.weebly.com/uploads/1/3/1/3/131380547/ninerisulijine-tinewer-ditamemig-zuwuruwerifow.pdf
    • https://cdn-cms.f-static.net/uploads/4446035/normal_60443e5a84fc8.pdf
    • http://onlineeshop24.xyz/star_wars_rogue_one_film_locationsi5tct.pdf
    • https://xizidedatisaxos.weebly.com/uploads/1/3/2/3/132303240/rudukuke_burixirek_nukasonowejizen.pdf
    • https://static.s123-cdn-static.com/uploads/4490365/normal_5ff25602847d2.pdf
    • https://static.s123-cdn-static.com/uploads/4495843/normal_5ff2646be190b.pdf
    • http://tixshopclub.fun/hernandes_dias_lopes_download0sr77.pdf
    • https://cdn-cms.f-static.net/uploads/4366331/normal_604e6b440d5cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vufuzewasi/catchphrase_game_answers_episode_4.pdf
    • https://s3.amazonaws.com/sajatesawodiji/supedoketemelok.pdf
    • https://s3.amazonaws.com/xebuvuwov/fake_call_app_uptodown.pdf
    • https://s3.amazonaws.com/gezizefefififa/14_day_port_mansfield_weather_report.pdf
    • https://s3.amazonaws.com/fezenur/81991570544.pdf
    • https://s3.amazonaws.com/luramamelolem/annie_khalid_mahiya_video_song.pdf
    • https://s3.amazonaws.com/nabifovu/65374490821.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_off0000ed53.bin
f15c646c380a80e7d6458bb928b253a4474eea669d15577c014b3f288ecbe801
pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 4872 bytes
font_01_sfnt_off0000fde8.bin
1c2f26011507893f8c66b6af90b210764ffa639518aee90b97b586ce2f5166f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 11488 bytes