Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa60c164e89c221…

MALICIOUS

PDF

82.6 KB Created: 2021-04-02 21:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 615f21a6e18f9f8ca72298924632de5b SHA-1: 5c7c2d2864168c7ec109ca3f7ed01b1645b07c7e SHA-256: 6fa60c164e89c221e972933814271fc819a207debb395465edfbcf2ed705fd54
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a significant number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a deliberate effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=guided+breast+biopsy+video
    • https://cdn.sqhk.co/fogunedevare/8jfjfgi/soropagaviragebulomiv.pdf
    • https://cdn.sqhk.co/zugivakizo/d3hhjbV/watezaboba.pdf
    • https://cdn.sqhk.co/pemenixa/piajcSV/word_cookies_cheat_cottoncandy_19.pdf
    • https://cdn.sqhk.co/sedazozesufu/hjEZLia/stickman_soccer_16_mod_apk.pdf
    • https://cdn.sqhk.co/lokutibu/2HjfjjO/47441178071.pdf
    • https://cdn.sqhk.co/xeduwukaxusa/hflShcC/62308283581.pdf
    • https://cdn.sqhk.co/pavujakorige/hgiihjg/best_camera_angle_for_zoom_calls.pdf
    • http://5gusevshop.space/medieval_trumpet_fanfare_sheet_music6r74u.pdf
    • http://richmaya.site/babli_badmaash_songjulkg.pdf
    • http://fijazubelanulek.mywebcommunity.org/pdf_annotation_note_taking_app.pdf
    • https://cdn.sqhk.co/jifegusewe/TCgcR4H/vagawixebid.pdf
    • https://cdn.sqhk.co/durotula/j8FqIih/pemopusexakobogoxi.pdf
    • https://cdn.sqhk.co/tadeketoxab/jbhchfw/nagizitedineveva.pdf
    • https://cdn.sqhk.co/damukowabij/jjvjcje/uefa_champions_league_winners.pdf
    • http://tryici.xyz/xopopedodosokekisej27ek.pdf
    • http://kodepovorivapi.mygamesonline.org/activity_on_node_diagram_example.pdf
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdf
    • https://cdn.sqhk.co/karelevo/idiizxJ/67646900061.pdf
    • http://cethq.xyz/dikepaduvan26mm9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_9c1e9bc498884860a65d06838a4e03ee.pdf?index=true
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_8ef1b56fe6e24ad3b8d462c48365ede5.pdf?index=true
    • http://vidugozu.atwebpages.com/convert_to_excel_candy.pdf
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_81c71eb372944a59953229a272c2b5a3.pdf?index=true
    • http://kuzemepusiloj.onlinewebshop.net/ionic_and_covalent_bonding_worksheet_teaching_tool.pdf
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_313024b17a694700bb098cbe86c000eb.pdf?index=true
    • 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_off00010695.bin
4bd87d146e9f51adad78e154944ea724f75627587c3b861031acd2176441a6ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 5256 bytes
font_01_sfnt_off0001188a.bin
2a51ccaba8b9c5bf4a695f074a69c307afcdc5dd857a24860381d68f9de355c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 10240 bytes

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