Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b28c149888b9c65…

MALICIOUS

PDF

87.9 KB Created: 2021-09-13 21:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2cb2d42aa8a20bd399dbcd2d3e8ad1e SHA-1: dfaad8a2b94c3990db1fe4f236346578aee8923d SHA-256: 6b28c149888b9c656c86942641e9ee55274f91ed1d5006e6715dd8ac626415fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=best+selfie+sing+app
    • http://elvirajogsi.hu/ckfinder/userfiles/files/vomamis.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/73504664901.pdf
    • https://tckontrola.hr/files/liropunamonumawu.pdf
    • http://csc-028.com/userfiles/file/20210904131000_25c5ui.pdf
    • http://futimisdev.com/userfiles/file/josukesiduxafekanejijofun.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/bubarojar.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/86582264248.pdf
    • https://pharma-tools.pl/galeria/file/57968220224.pdf
    • https://mehreganimaging.ir/images/upload/files/48802098631.pdf
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/46492008477.pdf
    • http://jump360.co/upload/files/20210908123831.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/1cf7c0471f96e9630f2cbc3a75f5f463/85097928461.pdf
    • http://fixafilm.se/userfiles/file/jusosiribikamonuj.pdf
    • http://www.truca-taoules.com/ckfinder/userfiles/files/tupitazepo.pdf
    • http://cbstav.cz/file/telewuvegagome.pdf
    • https://thokhoavietnam.com/upload/files/dalisikitoda.pdf
    • https://patoman.ro/ckfinder/userfiles/files/lorajes.pdf
    • http://4bx.pl/public/file/peralivozigizinenagigawi.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/46599944447.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/33358655747.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/dovitarolerejowofofu.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/feguvadedasi.pdf
    • https://noventa.cz/media/files/file/fililoxiwegokeji.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_off0000f525.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 16792 bytes
font_01_sfnt_off00010d3c.bin
44f9f9e44ee0e3b8f31a735141bae67b885349090cd96f4c8a05f679678f3230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 10364 bytes
font_02_sfnt_off000124c8.bin
5228969d16951de1cab35efa875b2f7242e4f03c27437ad9bb68c0e2e6339e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 17508 bytes

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