Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91561d48308ced0…

MALICIOUS

PDF

125.7 KB Created: 2021-03-16 09:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e59ed93688cd7a4b3d14bc40663e1de0 SHA-1: 237bb776e5f75ae169fb91c12303eef0af3a487b SHA-256: b91561d48308ced0ba105b8bb97d3cdd78325772e73a99f3fefe0bab221414e5
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a large number of external links, with one prominent URL pointing to 'vilenefex.ru', suggesting a phishing or malware distribution lure. The presence of numerous links, many with numeric or keyword-based slugs, indicates a potential link farm designed to improve search engine ranking for malicious content.

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 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.
  • 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/wix?keyword=rancho+los+amigos+observational+gait+analysis+form PDF link annotation
    • https://cdn.sqhk.co/ramawuvade/hGfhejj/light_house_cafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fd626f229423.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/7rAjgjd/wosodibifodomeredumi.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/igeghiQ/widoxelisamebezujugulu.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/Zo7ji56/xosimiporix.pdfIn PDF document text
    • http://gunasog.iblogger.org/cycleops_magnus_smart_trainer_manual.pdfIn PDF document text
    • http://nunopasatipimav.medianewsonline.com/33681380421.pdfIn PDF document text
    • http://dugarudewemudo.sportsontheweb.net/72082219515.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388282/normal_5fe57ebee9149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450628/normal_5fed71f5daeff.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
    • http://kevatudoritek.rf.gd/14879214242.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/first_alert_carbon_monoxide_detector_beeps_3_times_then_stopped.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_ae5598afb8854197bdbf544cb85f551b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/bahumathi_movie_songs_free.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/fesekobinamufoxogitagi.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/warframe_nidus_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/94451691515.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/bodyweight_workout_routine_to_get_ripped.pdfIn PDF document text
    • http://vulebodifoguvar.epizy.com/tricks_to_solve_boat_and_stream_problems.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_off0001a2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2E5 5392 bytes
SHA-256: cb9f8936fc59e258546ca6de4d05080b17a358464a4e5868f4a2b64b456eae67
font_01_sfnt_off0001b515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B515 11032 bytes
SHA-256: e1f80432dcab6d894b054550dc2811f5e4f95ac83e110f04fcc8c16deea46e99
font_02_sfnt_off0001daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAA9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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