Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28eeb6dda3e70cb…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 21:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2efa249959341e5ad51c3c89c021a160 SHA-1: 2e8978d8c8f2ba62cc23a1f6c95318331fe54b00 SHA-256: b28eeb6dda3e70cbee19cbe2a95bf87437c03e915f9cc344d77e486250954934
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=among+us+hack+apk+mod+menu+2021
    • http://clickvay.com/upload/files/jesugawegunalonajukafil.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/sidomolevonafegogij.pdf
    • https://principesgs.com/userfiles/file/tajufaxijunefexudezawe.pdf
    • http://kapsalonindex.nl/images/uploads/81045241068.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139216fd5c55---jedanonejeturotixavekud.pdf
    • http://teenmag.cz/userfiles/file/vosipobebaniwanukoxafe.pdf
    • https://ambalatender.com/upload/files/zorerani.pdf
    • http://rgn2u.com/userfiles/files/tolunorur.pdf
    • http://vvk-wiedermann.at/userfiles/file/83133591005.pdf
    • http://jr-bang.com/uploadfiles/20210924172107.pdf
    • http://nato-denkmal.de/uploads/file/23258185092.pdf
    • https://alhurwallpaper.com/Files/files/201380823.pdf
    • http://defhjdrjioo.friend-match.com/upload/files/dusax.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/muwibebevetofeniw.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/bosofapotepiteroragarovel.pdf
    • http://dulwichtaxi.com/survey/userfiles/files/41953776671.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/zelalebenarumapebuwizude.pdf
    • https://tommytest.dish1314.com/data/html_editor/files/zapemiwinewazavupemoj.pdf
    • https://sardiniagreencoast.com/userfiles/file/tuxujapukanemob.pdf
    • https://pielinks.com/UserFiles/file/29192849008.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad467eb909---jolivir.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/davanebojobokuvivisabeg.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_off0000b028.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB028 16792 bytes
font_01_sfnt_off0000c83a.bin
0bb79b3310d25452cb3f502165f7c09419490e9ed4fcd949554964a5c810f3f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 17376 bytes
font_02_sfnt_off0000f40d.bin
26770cb19f3dbd5d0bcb6d3fc2b37e150e63cde849ac43efc68e35ae9b925e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 11092 bytes

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