Malicious PDF — malware analysis report

Static analysis result for SHA-256 607bd8ed10f8b627…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 12:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bcc2f751b98b7a5b42e923c44eea862 SHA-1: aaecf9e8c84414862d8d1dacebe5d2b660e8f4f2 SHA-256: 607bd8ed10f8b627c23eee13f948f3e3f477ff8ddd62cf519cfa7742b9588142
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which appear to be part of a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity. The primary goal appears to be luring users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=ola+tv+10+download+firestick
    • https://www.corpeverest.com/ckfinder/userfiles/files/94680407072.pdf
    • https://linkevicius.com/upload/galery/file/3955018601.pdf
    • http://euhoca.com/js/ckfinder/userfiles/files/99284969055.pdf
    • https://ichibaninfotech.com/ckfinder/userfiles/files/58760182562.pdf
    • http://guitarenko.fr/img/files/54311669019.pdf
    • https://mobilieroccasion.fr/uploads/file/9319921704.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1cb61f7388a906b6841d4a89c2047372/nemabibeluw.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108dfc70fe---10209145377.pdf
    • http://synergienetwork.net/userfiles/file/88331059694.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/10213662220.pdf
    • https://travelsafeway.com/userfiles/file/99121556156.pdf
    • http://lamexmarket.com/uploads/files/jexugokirixux.pdf
    • https://maconlux.lu/userfiles/files/81259553992.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/88791845543.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/75805728023.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210904_030352.pdf
    • http://theclubburger.com/uploads/files/59513473010.pdf
    • http://asremajazi.com/uploads/files/rofovovowobapujonanuna.pdf
    • http://weiddy.com/uploads/files/202109162207583347.pdf
    • http://rallyteamwalraven.nl/file/mopitewurataf.pdf
    • https://mimpishio1bet.net/contents/files/79545667288.pdf
    • https://ecoquimica.cl/dinamicos/uploads/file/32350522014.pdf
    • https://agri-mal.pl/userfiles/file/xotuvadejawepanapefizukin.pdf
    • http://cuoredicane.it/userfiles/files/jaxewarukorexipilasewu.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_off0000db90.bin
d5975584ae22e00f3ed7f8c530ae4de210f2ecc76ad7cf9065df43d58eb4240b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 10912 bytes
font_01_sfnt_off0000f512.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 16792 bytes
font_02_sfnt_off00010d24.bin
bd116b41787892d5289ed4be67c4ca292acd4800a19de4099f307796d805429c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 19156 bytes

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