Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4a3f925623c9d9…

MALICIOUS

PDF

71.2 KB Created: 2021-10-02 11:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8500d2011c9c790c6bdaa8d6a001d0a SHA-1: c4c48a055fd2b08a3250a9a4be2e5f2d67dab95c SHA-256: 0e4a3f925623c9d91d07b190313b73fc2718b24eb4baba7f41800257a59c5d92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the suspicious nature of the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=meaning+of+notation+in+maths
    • https://mackbeks.com/files/file/21411786266.pdf
    • http://xsteelstock.com/d/files/divibamadariritapomexem.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613315715a267---golumodeke.pdf
    • http://adveotec.com/img/file/16222778495.pdf
    • http://msslink.ru/userfiles/files/73670021905.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/42494869030.pdf
    • https://menokatea.in/ckfinder/userfiles/files/pepedolobivijos.pdf
    • https://dananeye.com/uploads/files/202109281719555620.pdf
    • https://reha.bg/content/upload/file/6017076599.pdf
    • http://tochalco.com/uploads/files/wososuv.pdf
    • http://alituncer.net/userfiles/file/sebenegararover.pdf
    • http://coming-c.com/userfiles/file/29789052227.pdf
    • https://responsible-tourism-alliance.com/content_file/files/nosurodirufavemavefa.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161302aaec70ea---zotuminebamavinezu.pdf
    • http://jplus-ag.com/upload/files/BodyFile__614B1D5EDB5F5.pdf
    • http://iranjobex.com/cache/fck_files/file/wefamiserasufosadumiwef.pdf
    • http://sarica.com.tr/ckfinder/userfiles/files/82246028081.pdf
    • http://kammatrans.com/userfiles/files/87540525314.pdf
    • http://allaboutdowney.com/userimages/46990983775.pdf
    • http://floralojistik.com/userfiles/file/17516111663.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/jilaloxa.pdf
    • http://standartbio.com/fckfiles/file/rexibolomanupajagodime.pdf
    • http://kppzp.pl/userfiles/file/kikamuturigemutuf.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/vimenomugiboba.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://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_off0000b201.bin
62943e3a6af4518f1e918d32f8930271afa7076b125b9e9ebf4413629e465b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB201 10508 bytes
font_01_sfnt_off0000c9b9.bin
af02ea553d282ce353036381a71693fcad3144415c3efcc52c35ecca76fbf767		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 17916 bytes
font_02_sfnt_off0000f6ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 16792 bytes

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