Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5640112146b169…

MALICIOUS

PDF

73.5 KB Created: 2021-09-29 08:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57215010e17b2192df2db2922f769b2f SHA-1: 6b7d3e38746945b7e1247a8f8882ffb3a34dcd16 SHA-256: eb5640112146b169956425706c508a52d0e61a79f9786511f16c614527442fac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://decom.pro/admin/ckfinder/userfiles/files/tevovaxevetakem.pdf
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/zojobova.pdf
    • http://brenno-tojestto.pl/userfiles/file/vuzubuxovotozudonos.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fizegeso.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161492a45442fe---luguvivanasugug.pdf
    • https://www.sudicobank.com/ckfinder/userfiles/files/tafanitesazupukokug.pdf
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/65547045710.pdf
    • http://patroha.hu/file/90374598501.pdf
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56044195928.pdf
    • http://hoanggiaphatland.com/uploads/image/files/betudovukof.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/24476444749.pdf
    • http://geredekombiservisi.com/userfiles/file/80040979103.pdf
    • http://dienlanhlongan.com/upload/files/3307646219.pdf
    • https://cebubigsellers.com/userfiles/file/kubuvusur.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/gevemiliguxodu.pdf
    • https://cissud.com/uploads/ck_editor/files/zigekazojelarabo.pdf
    • https://k31szmq42-nu28.com/contents/files/60805337646.pdf
    • http://www.alfapilates.pl/upload/file/kowejakijolaroz.pdf
    • http://tavaszitura.eu/userfiles/files/95633119673.pdf
    • https://tatvan.in/userfiles/file/vowijoxadapefuviwuto.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/29349706315.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/57dd85a60f4d172cdf3514faba43d50e/59315934212.pdf
    • https://aarhuskortet.dk/images/file/68736667543.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/16568361806.pdf
    • http://stoka-saarlouis.de/userfiles/file/popanipe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=italo+calvino+italian+folktales+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_off0000b622.bin
9ccac34b8032c4ffa677b32e3817ec8d5bee0397dcd54bfe5de614c4f205dff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB622 10620 bytes
font_01_sfnt_off0000ce8d.bin
d698e4c56f60f74138fc260283b962c39008690607986ba09c3b3d3962424300		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 18840 bytes
font_02_sfnt_off0000ffc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 16792 bytes

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