Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b9779fa1122582…

MALICIOUS

PDF

79.8 KB Created: 2021-10-08 02:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3252b643987a602dd572b4ebeebfd942 SHA-1: fb1bb0e8abd0d8825b9e96edb1301d10457285db SHA-256: 72b9779fa1122582764a880bb1a4b671643a3e9328682f196dc318ac1f8c6697
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to redirect to multiple other PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://koreapyogo.puruemi.com/userData/affis_board/file/zokutom.pdf
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/52284241357.pdf
    • http://distant-property.ru/fck_editor_files/files/jewobotuzoju.pdf
    • http://61kidsclub.com/userfiles/file/wenuxuvo.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/18074218694.pdf
    • https://ifunb.com/shopadmin/upload/files/zixotab.pdf
    • http://carscaso.com/js/upload/files/42955409250.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad57d7a651---24246769658.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/bifixawefezuwufusogo.pdf
    • https://eltechma.com/zdjecia/fck/file/gusow.pdf
    • http://htygroup.com/upload/files/68947807769.pdf
    • http://eikenhorstgroep.nl/userfiles/file/29578415741.pdf
    • http://rickgrisolia.com/userfiles/files/rerodezomujegapoted.pdf
    • http://ruben.pl/ckfinder/userfiles/files/49387633188.pdf
    • https://oceanflowerhotel.com/uploads/image/files/taxotimapajotebowovorize.pdf
    • http://westernstudioservice.com/admin/userfiles/file/laxigasudexolasuduluze.pdf
    • http://webantikvarium.eu/tmp/nadubewakodijupenuxe.pdf
    • https://ms1oke.com/contents/files/68205185386.pdf
    • http://madmojo.com/fckupload/file/jamonogoduwuxojuxa.pdf
    • https://ww170002.linebot.net/upfile/files/20210925161558.pdf
    • http://mcutech.net/files/79064616375.pdf
    • http://debeleven.net/UserFiles/File/giwovegikuzu.pdf
    • http://gainliving.com/upload/editor/file/dufaredis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=target+market+users+example
    • 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_off0000d1d5.bin
28880d735ee8f50eb006bdec739d6e76f2594ccc86fe499f01fad3b35654e529		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 18380 bytes
font_01_sfnt_off000101e9.bin
62bd4c333bf6f5ea47faa3957d6718834b5ad48740e79fb4223b5cc42fd43304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 10536 bytes
font_02_sfnt_off00011a0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 16792 bytes

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