Malicious PDF — malware analysis report

Static analysis result for SHA-256 935dc0665e263d0f…

MALICIOUS

PDF

83.4 KB Created: 2021-03-10 12:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9727c7a44d20931f367acfd25112065f SHA-1: b09ce130c01d2bc4cc7c4df6cea456e9aa467ba3 SHA-256: 935dc0665e263d0f6600e51836594db9bb5d231217afa4364f99a49af7ad509a
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'fokemale.ru', which is likely used to serve a secondary payload or redirect the user to a phishing site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting a malicious intent to distribute or redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/123?utm_term=house+rent+agreement+format+in+english+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5ffbe626305bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_6043062fd5145.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/yBhaWgi/49814545459.pdfIn PDF document text
    • http://xoguralelufilo.iblogger.org/31361317018.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/ixkihgf/crazy_taxi_unblocked_games_66.pdfIn PDF document text
    • http://tenakotete.22web.org/framed_ink_marcos_mateu.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/aiaXggi/footsies_game_browser.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/hptOieh/gods_of_rome_game_offline_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5fe630b4b4441.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://s3.amazonaws.com/musokejixami/berotipesiwubiwepimiz.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/meyers_singleton_c_template.pdfIn PDF document text
    • http://razafif.epizy.com/xekidiwirifubenekewitonol.pdfIn PDF document text
    • http://vinuwivuko.rf.gd/6215954366.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_0a95c4e8d10b4d2f8eabf4b81acde0ff.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_7e33fd89f5f54f43b45a8c6cbe4ced78.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_be84c2cbaf3a47f2a1b3710d2d844cdd.pdf?index=trueIn PDF document text
    • http://tuzuvas.rf.gd/branches_of_linguistics_with_examples.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_95e88698b3724a428a73abe791150151.pdf?index=trueIn PDF document text
    • http://xesunuz.epizy.com/tadomanafeduxupizuxuwig.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_be2ad851d3f245f5a9bd0fd6b8162767.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebenok/nebofu.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_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 5296 bytes
SHA-256: 3522144ec8a657c6bedee0d9258d5f1e9e0fcab95480d92296fa6b7b703e90d2
font_01_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 10804 bytes
SHA-256: 10b42170c69a8994914293917de152686a6eccd09b16fdf3f0d72db8c72b7acd
font_02_sfnt_off00013215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13215 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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