Malicious PDF — malware analysis report

Static analysis result for SHA-256 1146620f15c274b3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 17:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2e3618f228814c0db3df379622bafc4 SHA-1: da1ca868b04e0125908641801632df2f19a431ea SHA-256: 1146620f15c274b33a83f146497eec682a86cb653aab445176fc7827aaca587d
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF viewers or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of external links on disposable hosting, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://etalentlink.com/uploadfile/file///2021090402254835.pdf
    • http://peach2560.xyz/js/ckfinder/userfiles/files/nusatilurugevar.pdf
    • http://studiodebiaggi.eu/userfiles/files/34317689167.pdf
    • http://maulich.vn/attachment/files/vavej.pdf
    • http://xn--or3bo5mvlb.com/data/editor/file/39309420348.pdf
    • https://villadelauca.com/userfiles/file/90785296595.pdf
    • https://jjcfurnituremaker.com/userfiles/files/pazelolo.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/65228508955.pdf
    • http://pieseclimaauto.com/files/file/xugefurewubeno.pdf
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/kokup.pdf
    • https://aramlasmerok.hu/uploads/file/67409845828.pdf
    • http://thepnguyentran.com/media/ftp/file/vafazerebewejira.pdf
    • http://rallyteamwalraven.nl/file/55136776875.pdf
    • http://chronocertif.com/userfiles/file/mapukemobubutogegos.pdf
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/norokidesadixinasozovi.pdf
    • https://eastoncn.housemember.com/uploads/files/15936703663.pdf
    • https://sadex.pl/fck/file/fazamijejivojadovamapiwur.pdf
    • https://lazdynumokykla.lt/userfiles/file/wixivijumetotisuli.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/a54dfe9525894a2a7f1670204ba51b28/70064756195.pdf
    • http://zjbfjt.com/upload/files/nawuwavodadokibiwuwuxif.pdf
    • https://geniodelweb.com/file/niniduz.pdf
    • https://mmszke.hu/files/file/vilemexujoded.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/dikelufajuvonaku.pdf
    • https://fajndoktor.cz/images/file/files/dulinapif.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38e580250---purekejov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=scalene+muscle+stretches+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_off0000cf01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF01 16792 bytes
font_01_sfnt_off0000e718.bin
5cf3cd93ea5fa8b278da8425f7814a1ff0ca4ae5787762ac1ce7aa8a3b42ff34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 10848 bytes
font_02_sfnt_off0000ffe7.bin
d9746272f839f4e5e32094d850976d8823a73aca2a983ffea4b803efea97c094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 17792 bytes

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