Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f566e0fc61bc8df…

MALICIOUS

PDF

132.3 KB Created: 2021-03-12 01:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 068552e3ccb56e2e48ba10aab08974e5 SHA-1: cf1e6d989cf7c7f5a9af15150ea32e02ac8cb9ea SHA-256: 7f566e0fc61bc8dff0a4307fef284e70b8c174c322a9a1d4312f3aa9bac14cab
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and uses a deceptive document body that mimics a research paper title. The presence of external URIs and the link farm heuristic suggest an intent to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/123?utm_term=impact+of+bourbon+reform+in+the+philippines PDF link annotation
    • https://bejeselujolir.weebly.com/uploads/1/3/1/3/131379719/202251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446638/normal_5ffe82cbd6ac5.pdfIn PDF document text
    • http://intekzafast.online/international_journal_of_education_and_research_in_health_sciencesnkgkw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_602aecb73095d.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/jfjjYgK/papa_pear_saga_android_download.pdfIn PDF document text
    • http://romeita.space/mario_party_9_rom1t876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_60340d3e80460.pdfIn PDF document text
    • http://studyweb.site/norcold_rv_refrigerator_user_manualayl0e.pdfIn PDF document text
    • http://testersairf.xyz/xobemutuxevexon4ii5g.pdfIn PDF document text
    • https://cdn.sqhk.co/mujutuzidip/le1ihie/desktop_tower_defense_strategy.pdfIn PDF document text
    • http://nutristrike-shop.ru/how_the_grinch_stole_christmas_1966_watch_for_freeceo2r.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/lefikokad.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/RgjQV2y/free_kick_goals_messi_vs_ronaldo_stats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458388/normal_60200a64f2ebb.pdfIn PDF document text
    • https://tidevaxapoled.weebly.com/uploads/1/3/5/9/135971763/3018594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_6040e57490e43.pdfIn PDF document text
    • https://cdn.sqhk.co/lebuzalezu/ntREvib/76790644263.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/fkgijae/enemy_strike_game_free_download_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2017cad3-2b6a-42b1-aed7-bc0bf76c34e0/6706866399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3244bc-4b57-4c38-8094-b3fd45e7f150/ocarina_of_time_manga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2917572b-bad9-4fde-99a3-025a37f3455e/saint_augustine_confessions_book_4_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a05d788-13c6-4d13-b8c7-08cf39c0101c/mokemugojojaxajinusoloka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3447910d-c1a4-4da4-bbee-12c029a2be5f/nikon_coolscan_5000_review.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC43 5212 bytes
SHA-256: 3b8b730a0e12e8bf79d5225be5fdbcb08ffbf9d9a5cfdad2fcad44ebb8b6ac88
font_01_sfnt_off0001cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDBA 11896 bytes
SHA-256: f6ded2974e3838bd06338a3016c50ce5dfa674e3aa78803d884b7c7cc88dd392
font_02_sfnt_off0001f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4BB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34