Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe58262de36cbe92…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 20:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a9ba496b6c9d20543dec21e47ebe706 SHA-1: 55031e8ff1c80940910d18fafdffa7fd6f765d76 SHA-256: fe58262de36cbe9268686eefd1414767e574ca0aa27bfee22d3b56834e10f86a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a non-legitimate purpose. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fotofolliasanlazzaro.it/userfiles/files/50378598098.pdf In PDF document text
    • https://saksisan.com/upload/ckfinder/files/26959709345.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e13b2448050aa528f9a98f8feb6f5bb0/vemomuj.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161392b46b5ddb---vemonuwomu.pdfIn PDF document text
    • http://ridendo.cz/files/file/28380633348.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/12546775329.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/90272607611.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/91906607026.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/reduxaj.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/votirodova.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/foxifetulifatake.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/vulev.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/tadaj.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/lanilisukapimulujimadeg.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/51890857668.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/bifaxezotamimolaran.pdfIn PDF document text
    • https://naves.cz/res/file/wafugebaxi.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/12668231241.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/13413716120.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/voziko.pdfIn PDF document text
    • http://zenithmetals.com/files/wavosiwam.pdfIn PDF document text
    • http://saaretravel.ee/images/file/viruvamov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+go+mod+with+joystickPDF link annotation
    • 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_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 19608 bytes
SHA-256: 7e2f4a3f69ebfdd1457caecc603002fa234a4450f5743d73ece892ea7e54776c
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 10932 bytes
SHA-256: e41261a0bd4fc0ad689781faecef5fa39f4760f82c404883265d121d2e1e6958

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