Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce2932776c2bb15…

MALICIOUS

PDF

76.8 KB Created: 2021-09-20 00:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db880b407ab4c53278df331b0a383739 SHA-1: 19b46ffba8d2fc20f09bdb7e08a05c2cb731f8ff SHA-256: cce2932776c2bb154bdf9310cde903725f5a414d76849901e3d1c6234215faf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=app+installer+apk+for+android PDF link annotation
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/75406531182.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/295fdaea60d8c7c38bf479f3fdc6bb14/85240152129.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/bovanitonejolala.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/dabuvokenivugij.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/bidipurijexujok.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/pupipusawikuworezasiv.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/zedovorob.pdfIn PDF document text
    • http://soc-in.com/data/media/files/95881534249.pdfIn PDF document text
    • https://jin-ji.com/upload/files/vabexafugafibok.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/lomekegupulebekesuto.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/nunaw.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/25815517049.pdfIn PDF document text
    • https://basisnomor.com/contents/files/dusosapogefawuwin.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210920045748_0mb3ab.pdfIn PDF document text
    • http://precisao.net/files/files/55763504766.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/27365521549.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/bonog.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/ketolujep.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/pupakukirake.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/28843904974.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea1b82bc2---84093772135.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/68362399802.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/nixarigop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 17388 bytes
SHA-256: e8577e1bc7a106839e5776d06462585b72cb1fcd7cf8bbeed3f90d5e48b1a6f9
font_01_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 10564 bytes
SHA-256: 15df8d3f460fe3724c36d691c26b101a72f2ce44a84bfe728d8929fd6bfda3f5
font_02_sfnt_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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