Malicious PDF — malware analysis report

Static analysis result for SHA-256 849c4aeabfd2c195…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 07:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71dbb3156fe12e49fc3761014b75c59a SHA-1: 15eaecf6701f495dd7804c15759b09e0bb55ef25 SHA-256: 849c4aeabfd2c1957d709c601c71dda308bdb03043819ad1a5e419ceb884d80e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The document body is heavily obfuscated, suggesting an attempt to hide its true malicious intent, which is likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://grandhotelbulgaria.com/userfiles/file/66084477587.pdf
    • https://sicurezzaips.it/uploads/file/93906031298.pdf
    • https://proartgaleria.hu/files/files/vadelefenupusej.pdf
    • https://beautyyaurient.com/editor_upload/file/xezosebofuriduzadanisi.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/92379777201.pdf
    • http://fleshlight-tw.com/userfiles/file/wawixufuvesaxenuwatupuvo.pdf
    • https://ewt.cz/res/file/41643859682.pdf
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/depopalomelelajivep.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5f076945b---7181523157.pdf
    • http://consulcongress.it/uploads/assets/file/3612633060.pdf
    • http://celyroknaterase.sk/editor_uploads/system/files/zatufedekixokufawup.pdf
    • https://nilsahost.com/calisma2/files/uploads/28392937459.pdf
    • http://nissanotogovap.net/uploads/images/files/21023210520.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/98505080273.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/wonemijozoxotuz.pdf
    • http://xy-interior.com/uploads/files/202109020032223355.pdf
    • http://lex.tj/img/file/8554544297.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=icloud+contacts+on+android
    • 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_off0000d265.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 16792 bytes
font_01_sfnt_off0000ea7c.bin
4d2ee1b8bb87aa3a6a3ef8270f7f74749ae324b0f1e66005f7b522ffd415230c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 10284 bytes
font_02_sfnt_off000101ba.bin
b403884f87fca8bdf324ed3b5580da88776675e98a792de3d28080a3eb94e034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 17168 bytes

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