Malicious PDF — malware analysis report

Static analysis result for SHA-256 859f93f0b3b2045f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 20:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e927a2cc4e2945b80b93b3af76d9b6e4 SHA-1: 7d6096de5152d5a82e3a1992d912c11face372d5 SHA-256: 859f93f0b3b2045fa43438438fe2c0a4ff4ea9902327dbcf03e0efe1355f690b
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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, and the presence of a link farm heuristic further supports the malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=guide+breath+of+the+wild+pdf
    • http://lienming-rubber.com/uploads/files/202109011917073650.pdf
    • http://modernplating.com/userfiles/file/76808915038.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bc4535ed77e8e4822f5c9d4473d31dd7/34070347167.pdf
    • https://itandem.net/ckfinder/userfiles/files/nasegaweve.pdf
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/30525127890.pdf
    • https://k85shj16h-561lt.com/contents/files/powavafowarifa.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/nidajuxugoziv.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/jilelomebezut.pdf
    • https://www.hmgfinance.com/ckfinder/userfiles/files/54588686115.pdf
    • http://energywork.pl/userfiles/file/dazolirotasa.pdf
    • http://sictombbi.fr/ckfinder/userfiles/files/nagesege.pdf
    • https://siriusdynamics.com/assets/uploads/files/bezubiripixawuzu.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/10045813967.pdf
    • http://jatechkj.pl/upload/fck/file/tojewaduketadofome.pdf
    • http://makassitools.com/userfiles/file///faxofitekazojeseg.pdf
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/18582894450.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff62ce910b---fovokebetag.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/6207051430.pdf
    • https://bleikss.com/userfiles/file/satuvajuwejijapizezo.pdf
    • https://drhuanghair.com/uploads/files/202109021214103198.pdf
    • https://kueapem.com/contents/files/visevisegegisa.pdf
    • https://stcc-sa.com/motakamel/Ups/files/zunulekezakovudixaw.pdf
    • https://marugame.hk/editor_upload/file/wijipo.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_off0000d6d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 16792 bytes
font_01_sfnt_off0000eee4.bin
76591bd9e56b2a832a446d1c7efb85d74cd83eca9563fb8aba39c3f2d530370f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 18264 bytes
font_02_sfnt_off00011dfe.bin
cab098d2339812df7ea15067f1a25951da613a5a8cfd425f7f75d63c19dcd762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 10688 bytes

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