Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ad2b35ad40ad98…

MALICIOUS

PDF

76.3 KB Created: 2021-03-01 19:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 43865f86aeef12e0fb46830eef09acd8 SHA-1: 3c10fd63f4f09bbec657f4f6e0fc7f9aec850a3a SHA-256: f1ad2b35ad40ad981e384d4248d9f53a3d2e19746064933ef3c77096620b3bdb
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to 'https://lozipotod.ru/award?keyword=dr+zhivago+book+synopsis'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The document body, though heavily obfuscated, appears to contain metadata related to the 'Dr Zhivago book synopsis' lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=dr+zhivago+book+synopsis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427526/normal_6014d7ee08f37.pdfIn PDF document text
    • https://cdn.sqhk.co/rifibimilo/jejejeg/ice_dragon_wallpaper_hd_android.pdfIn PDF document text
    • http://com-connexion.xyz/67397898556auwwk.pdfIn PDF document text
    • https://cdn.sqhk.co/poniroxam/Aii5SDc/cafe_racer_seattle_calendar.pdfIn PDF document text
    • http://rakuxijewimafud.22web.org/boom_truck_daily_inspection_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_601b428d9e804.pdfIn PDF document text
    • http://summer-italy.fun/summary_of_seedfolks_characters50ikm.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/68415471812.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404959/normal_5ffd20a041bca.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/29aa97b.pdfIn PDF document text
    • http://redtea.space/iskysoft_video_converter_ultimate_crack_free06bpv.pdfIn PDF document text
    • http://leoidet.xyz/troy_film_scriptk2s7r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visiporogid.epizy.com/tutorial_autocad_architecture_2015.pdfIn PDF document text
    • http://durunorutap.epizy.com/how_to_ace_a_dental_assistant_interview.pdfIn PDF document text
    • http://dixadenidufudu.epizy.com/police_report_template_nj.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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 5464 bytes
SHA-256: 908fe637f6fe4cd0c136a1b527b491e308aeaf22eaa305d0d97a534955925a14
font_01_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 9984 bytes
SHA-256: 5d6384d0d879f99152680b4c10a1513ccc8ef3ed37d26e1dd826d2d2b95b9399

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