Malicious PDF — malware analysis report

Static analysis result for SHA-256 7460265b0bbbd43d…

MALICIOUS

PDF

101.1 KB Created: 2021-03-24 18:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6e38f5842f5161e97ad3f3fb29a24056 SHA-1: 9f19e2c210d3b8b6308670377681b21b557474ef SHA-256: 7460265b0bbbd43d35be5b03e6ccd6e4d6584fe33e23347c4f5581a9500df001
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, with heuristics indicating a link farm designed for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to suspicious domains, with `vilenefex.ru` and `bigops.fun` being primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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/award?keyword=l+imposture+bernanos+pdf PDF link annotation
    • http://bigops.fun/91459900183hkds3.pdfIn PDF document text
    • http://avto-trokot.xyz/the_law_officer_s_pocket_manual_20171kbpa.pdfIn PDF document text
    • http://zobebukore.22web.org/57766628282.pdfIn PDF document text
    • https://velaliwud.weebly.com/uploads/1/3/4/6/134644949/mixapexezo_mavaramixago.pdfIn PDF document text
    • http://setlyb.online/is_slavery_legal_anywhere_in_the_worldr7ogo.pdfIn PDF document text
    • https://medowiwufaj.weebly.com/uploads/1/3/4/4/134480571/3404183.pdfIn PDF document text
    • http://crispyset.online/duwubikul06f0.pdfIn PDF document text
    • http://connexion-amelii.xyz/roxudagijawituse43m93.pdfIn PDF document text
    • https://wusulanapezuvu.weebly.com/uploads/1/3/4/3/134325740/lutaro_wesipesemon.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://uploads.strikinglycdn.com/files/46d47ea1-6ccc-4a9b-8e14-b769e2a50bf9/kedekerutidepaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d3c026-60e7-4afc-b76c-c8d991dc7890/is_the_keurig_k_elite_worth_it.pdfIn PDF document text
    • http://mujofekiroteped.epizy.com/weekly_vehicle_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a716b87-7b45-4e56-b789-67801198f403/la_maestria_del_amor_capitulo_12.pdfIn PDF document text
    • http://jimabepur.rf.gd/78411185463.pdfIn PDF document text
    • http://fosoxubap.epizy.com/82549985272.pdfIn PDF document text
    • http://zovitox.epizy.com/23164994484.pdfIn PDF document text
    • http://fefipunoz.rf.gd/walking_dead_comic_book_collection_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fcb88c-3b2a-4f9a-8bb5-20d55b125893/small_engine_repair_business_plan.pdfIn PDF document text
    • http://musajaso.epizy.com/topics_in_algebra_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b040cd-e9a5-49e1-98f4-bd3957c3263f/24932135641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005aa463-82cc-4817-b479-827078e2f3f8/4241637583.pdfIn PDF document text
    • http://jabowedufup.epizy.com/gb_whatsapp_2019_app_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5616233e-e80b-419c-a16b-746663919218/jesigitegesiwipofega.pdfIn PDF document text
    • http://kolavosenake.rf.gd/adobe_acrobat_x_pro_edit_scanned.pdfIn PDF document text
    • http://forozilixoder.rf.gd/physics_graphs_of_motion_worksheets.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_off00013ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE6 5116 bytes
SHA-256: 2492631cbd81e4532085d407ce1559e11d6ae3e552999eca59b1d52f7432d69d
font_01_sfnt_off00015026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15026 12708 bytes
SHA-256: 1e58d808a68fc5de51a33ce88fb2a981fde48ea43c802c06e5fe0d061c69643f
font_02_sfnt_off00017771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17771 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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