Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3fc516793322e2…

MALICIOUS

PDF

77.8 KB Created: 2021-03-30 00:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1c504a9cabfd2c9781e6b3474c9b0a7e SHA-1: 809cfeaa4a8027f2d3cd9d078a1f387efa6bfa43 SHA-256: 4b3fc516793322e2724b15dad1fc495d4d8346af82473f75082417a3532b9392
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://kuzutuzo.ru/award?keyword=double+accounting+system+pdf PDF link annotation
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/gibelajupu_tuzitugaxaxav.pdfIn PDF document text
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/vozekudopo.pdfIn PDF document text
    • http://dsv-trening.ru/physics_chapter_3_acceleration_testgcbkm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_6012a991a3181.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/jhjijaK/the_startup_game.pdfIn PDF document text
    • http://nonretloli.site/what_happened_in_attack_on_titan_season_36cveh.pdfIn PDF document text
    • http://trixy-matrix.space/neduxibapedogixisejotgodns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411683/normal_60311a996f3bf.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/EKWjcji/thomas_friends_thomas_halloween_adventures_dvd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466673/normal_5fce6bd64000b.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/fikibor.pdfIn PDF document text
    • https://cdn.sqhk.co/razilipot/m47jchb/space_background_images_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489583/normal_5fe1c10b9c9ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_f331110416dc4835bdd6a9efe5b96cb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/54259844737.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/pergolesi_stabat_mater_dolorosa_sheet_music.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_0b7303756ffa4b97959892c9d2722810.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lunojol/how_to_repair_the_heating_element_on_a_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/hormone_replacement_therapy_in_menopause_guidelines.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_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 5620 bytes
SHA-256: d0e0c090dcd83f7f29acf7e4ed2eb083f92f1c034009714baeec04f33dd1608d
font_01_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 9924 bytes
SHA-256: 3e8b30d5b0c86c4e1bb1fd75f68c655b3558b5f90246b3a68a3ebf0093876bfa

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