Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5af1b59539690a8…

MALICIOUS

PDF

89.3 KB Created: 2021-09-17 19:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec2a41a24c9e26d7c44ec9b0cb4db46f SHA-1: 32bb18c79d8cc181ade70f37e490f925f5075897 SHA-256: c5af1b59539690a809d0e994a64618aee3932f7ba714a5ea4b912d86f10090f0
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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 https://huntic.ru/uplcv?utm_term=naruto+senki+war+of+shinobi
    • http://anticacarsulaeborzoi.eu/userfiles/files/norimiritizuzirig.pdf
    • http://omegapizza.net/uploads/files/popon.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/vigefuf.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/23177d85f8d2fa70af9ac182cde04adc/rapozunoporib.pdf
    • http://xindeshiye.com/uploadfile/file///2021091311292293.pdf
    • http://samnakthodrahassob.com/userfiles/file/jabomisifafasovor.pdf
    • http://rogersdesignhouse.com/uploads/files/28227766085.pdf
    • https://mmagame.com/userfiles/file/53283340756.pdf
    • https://thehouseconcert.com/ckfinder/userfiles/files/83640034079.pdf
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/49100280490.pdf
    • https://debden.org/userfiles/file/
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613446265f06e---61773185355.pdf
    • http://ubestsports.com/imager/files/20210909124532.pdf
    • http://studioguidobarbieri.it/userfiles/files/fokaxofeboje.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/zemunowefudizuruwopub.pdf
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/kinufegoj.pdf
    • https://wct.goldcrownresort.com/magazine_files/files/dusupakatijabowukidowi.pdf
    • http://archissimo.eu/userfiles/files/1801785209.pdf
    • http://asude.istanbul/ck_images/files/33029576673.pdf
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/kugituxalogejipafixazedu.pdf
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/49817788190.pdf
    • http://kedehg.com/ckfinder/userfiles/files/moweg.pdf
    • http://refah4ter.info/basefile/hotelrefah4terir/files/lavebibosifaluva.pdf
    • https://serka.com/serka/upload/files/vivojuniwolajajud.pdf
    • http://www.almansori-ye.com/almansorifiles/files/56884390642.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_off0000ee1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 16792 bytes
font_01_sfnt_off00010631.bin
6453b23061b13fc31e3391950e8ede90b3b52ceb18685ee35f1ed1b7b8a93dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 10660 bytes
font_02_sfnt_off00011eaa.bin
6550ffe30808e2c0b502a0426d20756ace9c709de92436ca643a09ee58861555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 21948 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.