Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc6db235428fcca…

MALICIOUS

PDF

81.7 KB Created: 2021-05-07 12:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2ebda9c0e6bf2fa3f59aca5f2933a27 SHA-1: d7d8b8d5ab106c7634e0cdd3af90e6d67fb5e3b2 SHA-256: 2dc6db235428fcca777b7791ed7117110c14808f5e63771293cb03d318a1b751
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farms, indicating a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains text related to software cracks, reinforcing the lure.

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://jumiwimov.ru/strik?utm_term=how+to+install+rhino+5+crack
    • http://capridigi.com/abyssinica_amharic_keyboard_for_macp95ib.pdf
    • https://static.s123-cdn-static.com/uploads/4451945/normal_5ffc29f9b1743.pdf
    • https://cdn-cms.f-static.net/uploads/4469375/normal_604830734df1f.pdf
    • http://betflixguvenilirmi.com/how_to_angular_velocity4hb8z.pdf
    • http://ledivezakaw.iblogger.org/eric_b_for_president_term_1.pdf
    • https://static.s123-cdn-static.com/uploads/4465003/normal_5fcb52476cece.pdf
    • https://cdn-cms.f-static.net/uploads/4448718/normal_5fdc0d1dbdbc3.pdf
    • https://cdn-cms.f-static.net/uploads/4402261/normal_602448097c25a.pdf
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fc6ae99da6e0.pdf
    • http://arenda-comp.space/54885910023eeo1.pdf
    • http://help-verifiedbadgecenter.com/palafogipigasifekivag3cizt.pdf
    • https://cdn-cms.f-static.net/uploads/4426416/normal_601200aaae2b9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_278db58474ba447ca62aa7daed91b8bb.pdf?index=true
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_173678328eca4a64a2fd82b72aa64333.pdf?index=true
    • http://migegavirunafo.rf.gd/forms_an_acidic_solution_in_water.pdf
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_8df1feb4a18245579ecd538639f9e22f.pdf?index=true
    • http://manomiwivisuf.epizy.com/shallow_easy_piano_sheet_music_free.pdf
    • http://najaxobefirag.epizy.com/acapela_multimedia_6_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed21.bin
aea05f3f647c4b9b41aaa59255fdea8d895a46810294c458dafbc967fa7e8df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 5128 bytes
font_01_sfnt_off0000fe9f.bin
71448b54c57db63fe73d3f06e4ebb84ba0168268654548c035a14765ad591e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 11220 bytes
font_02_sfnt_off000124f8.bin
503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 16060 bytes

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