Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6715b17194d516…

MALICIOUS

PDF

92.5 KB Created: 2021-09-15 11:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4966fa39df9dccbb140fe0b720ea9117 SHA-1: 6248fdcae121689a443d0891a50cfc62481e66ed SHA-256: 0f6715b17194d5169c787c5aaa0630f6b44c74b48bb7e4cf9529e0acb07ac548
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious payloads. The presence of numerous external URIs, many pointing to disposable hosting, suggests a link farm or phishing attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely for distributing further malware or conducting phishing operations.

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://coretry.ru/uplcv?utm_term=song+of+solomon+book+pdf
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/bunaputusizelixutukeso.pdf
    • https://arichaindia.com/userfiles/file/21037627699.pdf
    • https://zenithservicos.com/userfiles/files/43046339572.pdf
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/4833616368.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acedfa881e---luwisosudenunepobev.pdf
    • https://vanvoorst.info/uploaded/file/63706075486.pdf
    • http://arcstema.com/userfiles/files/83436533573.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/15975629717.pdf
    • http://samtekelektrik.com/files/83563322002.pdf
    • http://kkagro.com/media/images/upload/file/logunexalimep.pdf
    • http://eakqshop.com/ckfinder/images_store/files/limukikokafer.pdf
    • http://studiotecnicodambra.eu/userfiles/files/55241712666.pdf
    • http://dentistturkey.com/image/files/61430453728.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/zamawopakokowatusoxipet.pdf
    • https://limblength-sldf.com/userfiles/file/11528327025.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/90473896388.pdf
    • http://ez-surveying.com/htdocs/cljr/data/files/tobegogififamomudu.pdf
    • https://tepihtrava.rs/files/5858164828.pdf
    • http://sahcarpets.com/userfiles/file/50421199025.pdf
    • http://tomaszfilipczak.pl/userfiles/file/latipudexolidakufefizutuw.pdf
    • http://thuocnam.xyz/images/files/34608618891.pdf
    • http://tdbm.vn/upload/files/63439140737.pdf
    • http://hophungvietnam.com/app/webroot/uploads/files/88705971199.pdf
    • https://mediaget.com/userfiles/files/pisupokuxebuku.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_off000103c9.bin
68c9a6b8ce9ce66ecb7a3536afc66bc8d09ff7f55817b4c1b20b8f9288e4b14f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 10564 bytes
font_01_sfnt_off00011b63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 16792 bytes
font_02_sfnt_off00013375.bin
c68515b97087fe49963e2556e6fc233dbe30afc0284050cbbcb156c35559cf83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13375 18828 bytes

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