Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b9b2a019026c67…

MALICIOUS

PDF

69.2 KB Created: 2021-09-19 00:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a5fbb3774e4da31d24d0b3a290ef27f SHA-1: d1f5046102842a9fd7b4a74e3b8a8228b938815f SHA-256: 17b9b2a019026c67efb1a61bedea61f3d1e1a84d987382127142a3025e68a90d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://krisoc.ru/uplcv?utm_term=call+of+duty+download+for+ppsspp PDF link annotation
    • http://agrion.org/upload/fichier/kexudilutaroruj.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/lojumakabimifoburilewupas.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/88018834708.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210902130723.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161456bfc556e4---wupojatiwodo.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/85030981895.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/5320408322.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210903122946.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/42269612470.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/lokatezasuzufopasadasemim.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/34361865240.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/40945224108.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210913_835485CE92F2413C.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/98575119.pdfIn PDF document text
    • http://medrea.ru/upload/files/mewevanalibutu.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7791628030.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/42207239272.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/17831265852.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/gogekemol.pdfIn PDF document text
    • http://decorstore.eu/upload/file/goriredupomoxuxanamaboxap.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/dixifakejudosofub.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_off0000b141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 10600 bytes
SHA-256: 6a09fcdc8ec413133167a4fd5206edda9cb9e8944d1f00fd4e96e735e2150641
font_02_sfnt_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 14760 bytes
SHA-256: b079e67bf0ffaaa18b0e46a74a5b34f797f0bcff981f33381c9fa5f00001ab40

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