Malicious PDF — malware analysis report

Static analysis result for SHA-256 9692fc94cc8e1d9f…

MALICIOUS

PDF

76.6 KB Created: 2021-05-01 08:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 96a4afd1c5aa67a133b715122934cde5 SHA-1: bc983934e1ac68e931598ccf2b543bed99fb7a18 SHA-256: 9692fc94cc8e1d9f7da1e2b80d90e16750b124932a7c70b00e937330fe86a8a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary malicious URL identified is https://vilenefex.ru/strik?utm_term=best+deals+on+front+load+washer+and+dryer+sets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=best+deals+on+front+load+washer+and+dryer+sets PDF link annotation
    • http://dress-russia.ru/how_to_write_a_good_personal_response_essayr1xkg.pdfIn PDF document text
    • http://bigowet.xyz/492106692k2xyg.pdfIn PDF document text
    • http://mexicotop.xyz/aashiqui_2_songs_free_download_hdj9sa7.pdfIn PDF document text
    • http://zapitexidij.mypressonline.com/xifuxitatipopatitopudote.pdfIn PDF document text
    • http://3bki.ru/94738751301aw9w8.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/78895692055.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/gdgiihd/73077565002.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/mN9Fhd9/lusebupageworujesikawu.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/jcgcEij/wodewuganidetojapasened.pdfIn PDF document text
    • http://jujavekerubeko.scienceontheweb.net/introduction_to_nanoscience_and_nanomaterials.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/carnatic_ragas_list.pdfIn PDF document text
    • http://ririzobe.medianewsonline.com/bebudurinajezefesaxopom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/13324681837.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_ca881e18114048688313ee63cb0297e3.pdf?index=trueIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_e34a1d5ea0fa458b9dbb04b8720d6dc4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/bookmark_manager_android_chrome.pdfIn PDF document text
    • http://tifilow.onlinewebshop.net/buck_converter_design_example.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_86bd2827f3b7483fbe2928410bc02242.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_fb01ee51311049ad9195f93ecbadc129.pdf?index=trueIn PDF document text
    • http://semowomeso.onlinewebshop.net/fatowovunaw.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_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 5236 bytes
SHA-256: fb6116e5951ba1e7675732a8fcd9570f5257382ae6ca77f674a69de0dd3ec9a0
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 10580 bytes
SHA-256: af030e48192f55a246b8a84afdc140b4bbc56fe0bb0a21e4740243a481c7ac7f

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