Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50c8303d4c4bb26…

MALICIOUS

PDF

87.8 KB Created: 2021-10-09 18:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93545340b76fdb823443d80317967ae1 SHA-1: 2845a32f55aa5c63d2ce9358b1218b980b041ca0 SHA-256: a50c8303d4c4bb2674cb009f7d75591b06ef141efe935c87d3d0aa9ebae60d22
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript that triggers an external URI redirect. This behavior, combined with the ML classifier and ClamAV detection, strongly suggests a malicious intent to lead the user to a compromised site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a larger network of disposable links, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://pistant.ru/uplcv?utm_term=divine+health+in+the+bible
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/66030135039.pdf
    • https://thefencedocumentary.ca/adminfiles/file/44171232948.pdf
    • http://edu-soft.ru/site/htmlimages/file/pukuvakumakesepavivep.pdf
    • http://mrpokedb.com/uploads/files/58473909497.pdf
    • https://leganordavigliana.com/uploads/file/74339552462.pdf
    • http://telecycling.org/files/file/28008485608.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41670380982.pdf
    • http://tikatalog.sk/_files/file/sixogilojizizaxuxo.pdf
    • http://skrabl.pl/www/rpbd/fck/file/43744200235.pdf
    • http://stluciachamber.org/uploadedImages/contentImg/file/mijepemafixupavusakag.pdf
    • http://backupcenters.com/userfiles/file/77874142797.pdf
    • http://fixafilm.se/userfiles/file/jusosiribikamonuj.pdf
    • http://ntep2008.com/UserFiles/File/birexitukub.pdf
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/51208935889.pdf
    • https://augsburger-dartliga.de/uploads/file/16359852336.pdf
    • https://qematalsihha.com/ckfinder/userfiles/files/rikajixuginit.pdf
    • http://chemicalengineers.ie/images/kapufogeripeno.pdf
    • https://haysalon.com/public_html/userfiles/file/28455464200.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/7850918237.pdf
    • https://olterus.net/contents/files/20235057952.pdf
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/lamovosepilimix.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/65674558130.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/logopep.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_off0000ef0d.bin
15d61a2e527bc0de1fb94312cde0e72d78c6f98db3d1813d04ff8fd45bf2ae8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 10024 bytes
font_01_sfnt_off0001053a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 16792 bytes
font_02_sfnt_off00011d4c.bin
7741850fd85195882fdad7b41802016d14afaa48c9b1e70ae756ae83308c91e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 20300 bytes

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