Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46ae75ba092ed3e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 17:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9db0d6e6a02ac008887b313d4205e2b SHA-1: 377d8c89d3448e717ffba42810751db2fb2b2d15 SHA-256: e46ae75ba092ed3e74dec91636093af39645c7ceadfc76a92427359db66ffbf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is structured to redirect users through multiple low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=money+monster+watch+online
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/004197505c346914626c241c944e46c2/21005726166.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a1d09b939---8366373015.pdf
    • http://ipceurope.com/assets/file/73792934881.pdf
    • http://katela.net/userData/board/file/kinutigametomi.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/fazobuxusaruwa.pdf
    • http://wxbeimei.cn/upload/ckimg/files/202109171353171385.pdf
    • https://suma.ca/upload/editor/file/xipadoweburetux.pdf
    • https://scout-educationguide.com/userfiles/file/98002398538.pdf
    • http://severstroysnab.ru/userfiles/file/bagerapewesubimibanoke.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/98169617398.pdf
    • https://sanipacific.com/attachment/file/14284815665.pdf
    • http://yokohama-model.com/userfiles/files/64578308714.pdf
    • http://dentali.cz/files/files/59821229979.pdf
    • https://themis-lex.com/userfiles/files/39870170327.pdf
    • http://pngroup.pl/ckfinder/userfiles/files/15818765659.pdf
    • https://delphin-bau.com/ckfinder/upload/files/janigusul.pdf
    • http://binhchuachay.info/Images_upload/files/21793701542.pdf
    • http://vikohasanfiber.com/upload/files/15483526918.pdf
    • https://aucordechasse.fr/vosImages/borizovitusubedigekema.pdf
    • https://dulsuc.cl/userfiles/file/88240596242.pdf
    • http://samnakthodrahassob.com/userfiles/file/33557999140.pdf
    • http://rent2day.ca/ci2/userfiles/files/nafuvap.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/jufizagejuw.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_off0000e850.bin
5c6890c8c085091b9aeb5ced618cfa439139304e7517fb4a03189cf04135db7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 10688 bytes
font_01_sfnt_off000100b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 16792 bytes
font_02_sfnt_off000118c5.bin
f583b955f0ee4b1689e9b5457a3b85777400287b2c5a65e7f619f0bc0fdc1443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 17336 bytes

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