Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a2f9ccad7cfa8e…

MALICIOUS

PDF

70.6 KB Created: 2021-03-31 12:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 757ce05fb4d226a922e67de1e861a27b SHA-1: ec04785c6c1adfc8259b6c430235812bd0d7e453 SHA-256: f4a2f9ccad7cfa8e2bf10fb3e212f0ead931b815309ca3b782dc82b255e3c767
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to disposable hosting, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The embedded links, such as 'fokemale.ru/strik', suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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 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
  • 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://fokemale.ru/strik?utm_term=what+is+the+definition+of+cognitive+behavioral+therapy PDF link annotation
    • http://frasqen.online/car_loan_calculator_malaysia_cimbeiivz.pdfIn PDF document text
    • http://kigurumi.org/whirlpool_gold_series_refrigerator_ice_maker_leaking_waterud1lu.pdfIn PDF document text
    • http://fullcreditreport.info/xepeg07sx5.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/5iiidcG/54584383684.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/2ijoojj/33963456244.pdfIn PDF document text
    • http://flylovel.com/dsc_pc1832_change_master_codegkprp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_e7bef48c65244ded8b7d3e47e5621e16.pdf?index=trueIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_3743475c038f41eb823c7d724bcdec08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f61f2e-54c4-4015-9198-52a37ae22b83/functional_fitness_exercises.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_b1c5a633b44d48569a39f9e99f61e4c5.pdf?index=trueIn PDF document text
    • https://aaf8962b-2ea5-4403-bfea-7c32f2b3f77e.filesusr.com/ugd/8f3a65_714a431e5b944757b2b18213b17b394c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5350be-7422-4798-8985-dde3b5a5e559/watch_huck_finn_1993_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2654ea9-7328-42ef-9a43-93c2b2709bb7/star_traders_frontiers_best_ship_weapons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e874ba6-9c6f-4d5e-9f9c-abaa608707d5/axial_yeti_1_10.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_e82ab5e9b2714f1eafae8c91cb38c7bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e031f631-13ac-428f-8a45-c77580a09a25/parupufumobira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1067aff-45ee-4f65-9a5c-fe2ddb46984b/how_to_write_international_shipping_address.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 5732 bytes
SHA-256: f2a3d39b6378aa9de64e0b2da311f75422df623d7768b33bd99c16885ec78e7b

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