Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7da28b51021920…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 21:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1c473f406343402b31e2e336fff00f9b SHA-1: a26e4bca45d5ca119f73854a49ef88cad0a49783 SHA-256: 9e7da28b5102192055d2bf972922decebfb84f37667f4a2e3bed7acb5c0efcba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and EMBEDDED_URL heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=sex+simulator+apk+game PDF link annotation
    • http://s2ipower.com/survey/userfiles/files/xupowupufujuxunarebu.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/sesejizuzobetidaxoli.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109130651374741.pdfIn PDF document text
    • http://z500.si/files/fokikubikim.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/fevopabamew.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/24764374093.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/sesidasuwewunatigupokido.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/vebavoneda.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/88581033205.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/19906595591.pdfIn PDF document text
    • https://novsport.com/content/File/10110849323.pdfIn PDF document text
    • http://momsystem.ru/public/file/20535912247.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/44535567446.pdfIn PDF document text
    • https://premiersuli.hu/files/files/48800114341.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/janaxekenuvifazogamixo.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/vagibizefipesib.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/86724170817.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b1597a94---5488668829.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/92328679502.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/dazorositesalagezijisadog.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091002152062.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/96649687853.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_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 10860 bytes
SHA-256: bcfc10faa35a70866ee034560af9003ce43df50d0cd7576773a1938a8324055f
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 18176 bytes
SHA-256: f9c7189381d30b8b081c655970c0e294a8d0a77ef6b2558c9647fd5ed6095fa3
font_02_sfnt_off000127bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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