Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f452a5fbaae959…

MALICIOUS

PDF

69.6 KB Created: 2021-03-21 20:58:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 821d45265965dd81543307d105137d93 SHA-1: a5f6f4006982ec17d1a82590de96208402c0cc15 SHA-256: e3f452a5fbaae95953627fd30a8867cfea1dab67fdc21a6eeb3a3102cbb68a97
126 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed for malicious redirection. The primary malicious URL identified is https://xezojetit.ru/strik?utm_term=fdot+index+304+cr-e, which is likely used to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://xezojetit.ru/strik?utm_term=fdot+index+304+cr-e PDF link annotation
    • http://stankoff.org/zatopowurafulevkkxe5.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/ghjjmN8/java_plug_in_1._7_0_55.pdfIn PDF document text
    • http://agreevudb.rest/22914448765qyrsc.pdfIn PDF document text
    • http://itfamily.info/baxikuzileripeterasxi3n4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_60475b647dab7.pdfIn PDF document text
    • https://cdn.sqhk.co/fukefipemuw/7igjh7r/70281779041.pdfIn PDF document text
    • http://nextauto02.ru/z3x_crack_36.1cm8jz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_60146b0daf496.pdfIn PDF document text
    • http://complect-tech.ru/logic_puzzles_puzzle_baron_answerss2jje.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/tuxexi/moturonavaledesureponof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a724d9c8-d2d5-4b06-978f-bced5125bb0e/bersa_thunder_9_uc_holster.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/40744508997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdaefad-7b31-4421-bfd5-e0ef29b5fa2f/wukilowafugafulowazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0370234c-ed31-43c2-9847-1b736ffe5c04/lenovo_thinkpad_t430_details.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc14bb5-b065-4ab8-86fc-038bc113e8d7/52975469361.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/revelimobitina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ef7e36-4339-40b0-ae9a-d8a08c9dab63/74586895416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5c59b5-8fa9-42c2-9afc-ca0550d8866d/97957694334.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/baleturuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eabcb64f-4066-489c-a483-4fca5b094aa8/earl_nightingale_quotes_goodreads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f71ccb3-1d05-45f5-82bb-b5d88b482a22/brother_knitting_machine_parts_for_sale.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_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 4964 bytes
SHA-256: ebd459025f7196997171d91fee96ea8da9ef44c245e519a626053ea3a50aa519
font_01_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 10492 bytes
SHA-256: a9905a9d4cff1b5ff7992f413481a3bb4a7b55d0d37f25bd8356d575513f684a

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