Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7362de94be6fb2…

MALICIOUS

PDF

68.7 KB Created: 2021-10-07 22:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9b26ff306417951dad3935c72bffbc1f SHA-1: ad700adea3eb8977de915c1debe26e148c1293b5 SHA-256: 8c7362de94be6fb28be07996f42f085c0e4500aa05c1afed26962df65d4e38ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains and are structured to redirect users, indicating a link farm designed for phishing or malware distribution. The 'wkhtmltopdf' authoring application suggests it may have been generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=first+page+design+for+drawing+book PDF link annotation
    • http://freewest.at/43430491633.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/79879754671.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/20983166993.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/zidobevame.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/rinedakiluxirapa.pdfIn PDF document text
    • http://placc.info/up_image/28567920701.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/vidogikederex.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cdfd07e6433d59f3e6054822adce07ce/sebavajem.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/vekesetavesiva.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/mologoxazosipe.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///35649935900.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///88696477239.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/nogexagifapagesa.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/83826282302.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16153f2f038bbd---55639933455.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/tevosedopoputefajiwira.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/3203955559.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE05 15244 bytes
SHA-256: 7aad3561892d1564d1c18f3968a37f8c2e28167c648f383600876b7edf60aa8e
font_01_sfnt_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 10924 bytes
SHA-256: 457da948596f04124262544414056ea44cb584c16f00478995891149b2a64b40

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