Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ac29c1adae3891…

MALICIOUS

PDF

71.8 KB Created: 2021-09-23 00:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edd86cc358a3d71f7eb6192b5afffa39 SHA-1: 4565e9d9670365c3ad5e2e7d6d002a8c93ba3bf5 SHA-256: 79ac29c1adae3891e0a6824e2b271adf6bcf250c50887e6486d8b7d59826d35c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://medvor.ru/uplcv?utm_term=android+get+all+images+from+internal+storage
    • https://harrisitalia.it/uploads/file/17615898064.pdf
    • http://vsrru.ru/userfiles/file/9543586649.pdf
    • https://emailchopper.rockeit.com/userfiles/file/jibutenadimibi.pdf
    • http://artospace.com/pics/file/89769366590.pdf
    • https://idroilektriki.gr/files/file/xiwetabelovanute.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/romisuzo.pdf
    • https://tidymoney.com/ckfinder/userfiles/files/94944767249.pdf
    • http://righetti-ticozzi.it/userfiles/files/varipavagagamu.pdf
    • http://www.centrosanmarco.eu/img/news/files/4531226158.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/fifazat.pdf
    • http://salkim.com/userfiles/file/tunumiziw.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021092305003280554.pdf
    • http://tencanpowder.com/d/files/tadagekorunawew.pdf
    • http://heaig.org/editor/ckfinder/userfiles/files/89440660134.pdf
    • https://arendic.cl/files/57963104300.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/rijojit.pdf
    • http://autodilykanka.cz/cmsimple/images/file/varotavopenomeg.pdf
    • http://hanasushi6.com/uploads/files/96523193341.pdf
    • http://marketingnews.fr/images/file/gilizanusujow.pdf
    • http://zjleiou.com/images/upload/File/mareped.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_off0000b429.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB429 16792 bytes
font_01_sfnt_off0000cc40.bin
5c686df5083ea961026503cd37246463be86540e29b2a61095737c345768fe50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC40 10680 bytes
font_02_sfnt_off0000e484.bin
de75057262f895becfbd7ab3e0f668a25597bd230b62e8264a68f9219f3d3d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 17536 bytes

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