Malicious PDF — malware analysis report

Static analysis result for SHA-256 13302574fc58179a…

MALICIOUS

PDF

69.6 KB Created: 2021-09-21 11:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6f680ac635e5b6aff90a6622d19fb40 SHA-1: ce612397e100e02a218b81ac32f8290b9f75d0ab SHA-256: 13302574fc58179a7bdc7bf7248f64c8381ce25e7a380bbd1bb2b09b87aa1744
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://nomylo.ru/uplcv?utm_term=wordly+wise+4+answer+key
    • http://finproekt-msk.ru/userfiles/file/mesibuneguvizu.pdf
    • https://value.ae/userfiles/file/pobafijulibebiromukubu.pdf
    • https://soudureornementalelauziere.com/upload/editor/file/92051268261.pdf
    • http://web5gstore.com/Files/files/wosirofaputogibupizidaxej.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/75757998227.pdf
    • http://www.radanhorse.com/resource/files/mulagodovuzufusolurive.pdf
    • http://badgerhillfarm.uk/genexoke.pdf
    • http://baugeraeteverleih.de/benutzerdateien/29736585745.pdf
    • http://benthanhsgfarm.com/images/uploads/files/75653439729.pdf
    • https://powerliteaac.com/userfiles/file/45097411613.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161335dfc97d34---wijinelimeso.pdf
    • http://opuspointpartner.com/ckfinder/userfiles/files/tizefejagawotixitobud.pdf
    • http://www.ufolep-69.com/contenus/files/48147692238.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d66ff3e5a---xosexininowukalekilawis.pdf
    • http://kes.org/upload/editor/files/zaxurewo.pdf
    • http://atlonnuri.org/UpLoadImage/editer/files/96801772727.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/91808553393.pdf
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/fugudutineza.pdf
    • http://indecomavo.pl/userimg/inc/mivalikenoxotum.pdf
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezunefeduwuxom.pdf
    • https://gea99.com/ckfinder/userfiles/files/64504697840.pdf
    • https://alcoquimicos.com/ckfinder/userfiles/files/notevobalejuf.pdf
    • http://garageanything.com/js/upload/files/33207774185.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_off0000b1d4.bin
19e2871fb0b630a8eb0659ad3f01c9586815d6f6a6028dca5409df13f2e7d9db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D4 15224 bytes
font_01_sfnt_off0000d8b3.bin
c09fa75a4d7a865f84b4d35f0907be84f743405f828f2207e83b15498bb2af08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 10508 bytes
font_02_sfnt_off0000f0cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 16792 bytes

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