Malicious PDF — malware analysis report

Static analysis result for SHA-256 c164921a94389f17…

MALICIOUS

PDF

70.8 KB Created: 2021-03-29 22:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 783cfc84c2b9ef0e4a7a43122c392fde SHA-1: 03a03e05244b6af92b3af9d8bdf7a74b8ce650fd SHA-256: c164921a94389f17e36bf5e03eb612e76851d6c06c129d46329b83529e7d46ae
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a primary external URI pointing to `vilenefex.ru`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection `Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0` and the ML classifier strongly indicate malicious intent, likely related to phishing.

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/wix?keyword=thank+you+ma%2527am+plot+diagram PDF link annotation
    • http://hangzhoumetal.ru/51302942092m0xtw.pdfIn PDF document text
    • http://evatopshop.xyz/chase_sapphire_benefitsvng7v.pdfIn PDF document text
    • http://bepelisufozasep.mywebcommunity.org/cautery_machine.pdfIn PDF document text
    • http://sreda.city/descargar_libro_de_algebra_lineal_de_grossman_7_edicionmkfov.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/2341207552.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f225de6-98cb-4bff-af1e-39b6f9e1634c/24679932585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45bc61da-09a9-495b-8834-37522306dbec/41339435546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111256ed-d0f8-48e9-a4b5-5aaf527503ae/28601178503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946a6d4c-ce55-42ec-ad4c-33c888026185/binofegemasavibidanapav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6391d0dc-c2e8-4896-986b-b67441edcdfb/myron_mixon_turkey_rub_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/93600276576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cba0bdf-d584-4956-be8f-64dbdcc12f16/how_many_pages_are_there_in_the_half_blood_prince.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a09c5c5-972a-40ee-b359-6c910f4b9932/koninasemorawabekija.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/new_bhojpuri_video_movie_song_2018.pdfIn PDF document text
    • http://wemaxoseni.myartsonline.com/marekugofogagoraveremaw.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/27806239016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2331724-0a26-4482-878c-e04ab9f12abc/pentair_intellichlor_ic40_replacement_cell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63e572c-1973-4930-96bb-d78d38f050fd/47077438857.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/sample_behavioral_interview_questions_and_answers_for_managers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f6afb6-011f-4997-92cc-1e909f0ebf10/devugeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb85193c-fa9a-473b-a15c-80bc5b810a3f/how_much_does_bubble_tea_cost_at_kung_fu_tea.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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 5344 bytes
SHA-256: 0725866fc23e417b23f625d8cf8d9a4492548a2db7c5ebe7ac9a74e31be61967
font_01_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 10528 bytes
SHA-256: 9258a59ce44da2d117ada49f09549b92a2621c9acfccd33a584713f267fe425a

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