Malicious PDF — malware analysis report

Static analysis result for SHA-256 21585ce486598f9c…

MALICIOUS

PDF

77.7 KB Created: 2021-06-08 18:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e62e7591a5ffab65a0fdf85adccf2b7 SHA-1: ae05e1d25fdff2d82766b2e786616dc638b5de5a SHA-256: 21585ce486598f9cbbf6e44cd78e233d7db0ffc5e60be1f3fb2f22b7d83f0d27
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'infrive.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting malicious intent. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content within the PDF structure.

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 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://infrive.ru/pbw?utm_term=free+sports+certificates
    • https://girezerel.weebly.com/uploads/1/3/1/0/131070389/japejixepiramigulug.pdf
    • https://cdn-cms.f-static.net/uploads/4490001/normal_6020d0639aa6b.pdf
    • https://vutizimowunofe.weebly.com/uploads/1/3/4/3/134354130/kidane.pdf
    • https://static.s123-cdn-static.com/uploads/4482218/normal_5fe47ff3d343b.pdf
    • https://static.s123-cdn-static-d.com/uploads/4529893/normal_60b6a1b79f358.pdf
    • https://cdn-cms.f-static.net/uploads/4408879/normal_606d35a716b17.pdf
    • https://vaxeratomox.weebly.com/uploads/1/3/4/3/134397216/mamevolaginewil.pdf
    • https://wabegikabakupoz.weebly.com/uploads/1/3/4/6/134668284/vexawepimuxobogi.pdf
    • https://static.s123-cdn-static.com/uploads/4482190/normal_5fc7e5c434121.pdf
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5fd0a25360923.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dujimowiwup.pbworks.com/w/file/fetch/144825768/77762047342.pdf
    • http://buxozodevoge.pbworks.com/f/roosa_master_jdb_injection_pump_manual.pdf
    • http://moxulolo.pbworks.com/f/jobuzaxokigafu.pdf
    • https://uploads.strikinglycdn.com/files/ac474e5a-ad2d-49c3-b241-c6223ad7094c/probability_and_statistics_sampling_without_replacement.pdf
    • http://zipiwume.pbworks.com/w/file/fetch/144818799/43112592572.pdf
    • http://xibosini.pbworks.com/w/file/fetch/144510825/budusudotegujuratow.pdf
    • http://puzavofan.pbworks.com/f/rockstar_games_social_club_crew.pdf
    • https://uploads.strikinglycdn.com/files/e9f9dc25-4433-4c79-8bb9-d427c56f57f2/how_to_become_a_pet_nutritionist.pdf
    • http://suzojadek.pbworks.com/w/file/fetch/144722253/99387703863.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_off0000f39c.bin
5afd81ba85c6053f14cdbb8964bdfe25aac9237ad60272d54a28f1fbf14394d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 4932 bytes
font_01_sfnt_off00010478.bin
6ff13eb31ff205e80d75d5d0bc59c4d0433eb3067e5bee71f9b70c56cc2eec64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 11020 bytes

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