Malicious PDF — malware analysis report

Static analysis result for SHA-256 3376b1a3875caaf7…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 03:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb1f24d5d3cbfbc250c3c3b309c9b2f1 SHA-1: 5fc9ffffa6e20390ab472ff2d849ebe453437fcc SHA-256: 3376b1a3875caaf751ef23d524cd9a2f41aa24871834953111827d532be83b86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the embedded JavaScript likely redirects to a collection of other PDF files hosted on various domains, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://viviapalermo.com/userfiles/files/25511602749.pdf
    • http://visusmarble.com/images_upload/files/97118245044.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/20085169093.pdf
    • http://paitoonbox.com/userfiles/files/78887750042.pdf
    • http://cycling-software.com/files/file/1733658689.pdf
    • http://coinproject.com/userfiles/image/file/mowakinipumenumedutojepek.pdf
    • http://studiocinti.eu/userfiles/files/safedirajebazuzuz.pdf
    • http://madiagranitosilano.it/userfiles/files/9784060018.pdf
    • http://proxima-design.cz/files/file/kagidodazara.pdf
    • http://ilkyoukais.com/Images/Media/files/lujenopa.pdf
    • https://robustbrakes.com/administrator/imagetemp/file/8306801057.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/23522270045.pdf
    • https://karpzbeldowa.pl/uploads/userfiles/files/donudot.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/zavoxezuvawamajelezeka.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140e40e08ca7---14207778791.pdf
    • http://urduhadith.org/survey/userfiles/files/zakojefogiwojetetudipe.pdf
    • https://abrasco.org.br/ckfinder/userfiles/files/ronagoguluzokan.pdf
    • https://limadelimon.com/images/file/61285729595.pdf
    • https://landtop.com/filespath/files/20210906203048.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161436c84a52cc---32403564875.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/68626711452.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/19381696817.pdf
    • http://athaj2.specialty-match.com/upload/files/nobededazaba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pathfinder+2e+bestiary+2+pdf+free+download
    • 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_off0000cf75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 16792 bytes
font_01_sfnt_off0000e787.bin
99e90951b32304bd03cefadc6ef420e72b3db1e33f11ad70c3f2a1c1985ebf94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 18000 bytes
font_02_sfnt_off00011669.bin
786dfc6e3fa2e1d6c1ef0a572d65d4f8b917048cfceed23cd3f06be77afa6915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 11056 bytes

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