Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32da429af465a42…

MALICIOUS

PDF

74.4 KB Created: 2021-04-01 08:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 19e49d60ad8d49bdc55566968d95ac30 SHA-1: ddefe14c316745ac6a17c93d24d05d868cb6fdc5 SHA-256: e32da429af465a42d980f97bf4375d851ff3d424b6614bc722474e78f9c6010f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a tactic of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/award?keyword=bonafide+certificate+for+scholarship+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497685/normal_6013cae33a47c.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/6sjjgip/international_business_machines_corporation_and_subsidiary_companies.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/0fa59b1f8415e9.pdfIn PDF document text
    • https://cdn.sqhk.co/zivupowixede/WhdQhaE/rackword_free_real-_time_multiplayer_word_game_apps.pdfIn PDF document text
    • https://xijexarara.weebly.com/uploads/1/3/4/0/134017378/vefem.pdfIn PDF document text
    • https://cdn.sqhk.co/tavolimogid/Fgix90Y/81193676954.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/Orahjia/wars_of_the_roses_movie.pdfIn PDF document text
    • https://kuxalureb.weebly.com/uploads/1/3/1/3/131383592/sagugive.pdfIn PDF document text
    • https://fofelopuvamugav.weebly.com/uploads/1/3/4/7/134716477/topitutetu.pdfIn PDF document text
    • https://cdn.sqhk.co/siganewita/hqNHk3S/71668830648.pdfIn PDF document text
    • https://cdn.sqhk.co/penomufepuk/jjigiSh/95824084017.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/mojolijaz_fekam_pizal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448547/normal_5ff342bdc29db.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/jfibDhh/sago_mini_world_characters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_e532745989524b0d9130ae20895e13fd.pdf?index=trueIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_8d3e3f7355074c12930f84dd2ecaa39b.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_82f7821a10304eba818d3a1902bab332.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_e7efe72a1130486ea12d1e3bca481ce7.pdf?index=trueIn PDF document text
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_d7800109662c4c2b96309cd4ac20e59c.pdf?index=trueIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_474e9f7c3bfd4d8ab9302eebe0aaadc4.pdf?index=trueIn 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_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 5292 bytes
SHA-256: d906c7be1b0c45e4d34ad00b8c2039128191968636128355265cc2cbbf3adc7c
font_01_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 12164 bytes
SHA-256: abfe161bbb5b913d768887d4df92739b8893bc4c6b07623413c4af03f3a47c20