Malicious PDF — malware analysis report

Static analysis result for SHA-256 b206755d827e934a…

MALICIOUS

PDF

75.1 KB Created: 2021-04-21 16:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0822e1a6936d8eb39fb91a7ec5374087 SHA-1: ee0de5a56e432d8dca793fea383b920e6a865a7f SHA-256: b206755d827e934adbe0727278634597c2007509ff155a51b5c812a1b3865b02
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded URL 'https://mezovuduw.ru/strik?utm_term=hiking+merit+badge+requirement+1a' is a primary indicator of the redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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
  • 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://mezovuduw.ru/strik?utm_term=hiking+merit+badge+requirement+1a PDF link annotation
    • http://bupro.asia/murudopikumamawukujl8t7n.pdfIn PDF document text
    • http://cocobuka3.xyz/60169548565h4l.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/askep_asidosis_respiratorik.pdfIn PDF document text
    • http://autoport76.online/logitech_extreme_3d_pro_review_2020wdcw6.pdfIn PDF document text
    • http://koreanluxe.com/94012696553df6ez.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://feedbacrnz.space/can_you_reverse_google_image_search_on_mobileimogp.pdfIn PDF document text
    • http://changely.club/toyota_corolla_1.6_professional_2009_specs5km7d.pdfIn PDF document text
    • http://baboguzaxeleju.mypressonline.com/antecedentes_historicos_definicion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_98f6b63068c44622b8d45b0cf8fc2448.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc02f44a-62b0-4fa5-9bfd-5bc02ff0aad5/64854496388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8955e8d8-e47f-4e9b-9bbd-d5825e6a94d1/62126398375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7ff23c-14d1-4d54-9536-86808df08998/nomajaponoline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0c3ceeb-648c-4327-bd47-e687389d34cb/bodagopogitatomuvovepiva.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_a9823b86ab774f8fab547705a1115000.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_2600ed87eaef4e64a23842472a4e453d.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_5e24ecc07856411c93cb211da5274027.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e3c7ee-295e-4423-b43b-cd636c3e55e6/asus_crosshair_v_formula-z_bios_flash.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_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 5276 bytes
SHA-256: b02b7d43e24af43bcd651cc91df6441b87fb9ff3264061385575985bb85f766d
font_01_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 10508 bytes
SHA-256: dc5a9ceb3f0bfa6bfac8e51952c59690105ad7f176e1417842953e01e2022912

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