Malicious PDF — malware analysis report

Static analysis result for SHA-256 17dba1ed5111d002…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 21:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c559c155ca5210480b4793784f252946 SHA-1: 5277f8abedd916c65d28d5aadd938c833928f9c6 SHA-256: 17dba1ed5111d002834e4c937fd85f03c7f037a7fd1e2199a48baf1a688fd489
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings like 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nonbodepsg.com/uploads/files/nutazifewixekuk.pdf In PDF document text
    • https://aczv.fr/userfiles/file/66725452842.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/21091119065199498597dmkg.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613395211751d---78727048432.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/bivogigoni.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/24895928047.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/71037548563.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/3a81f2052be65b58031eb7d2ae31c0eb/88875070244.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/mujipufopaviguzumodi.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/33162056832.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/lolunifalivenujatada.pdfIn PDF document text
    • https://dukupahit.com/contents/files/pinabigike.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/lurofisirekanope.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/mikeketegiruvojojiwaxidal.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/jujoxulewu.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fesipemeza.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/kidokupuwonegefitopikipet.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/79021081230.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/boxigotikizivowifunise.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/ravisawapedibi.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/11075855032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=integrated+cost+leadership+and+differentiation+strategyPDF 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_off0000b06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06D 15428 bytes
SHA-256: ee383f642c307797bfb97712fbc41ba7bffd8cd424864f7fa028bbafc5e02227
font_01_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 10964 bytes
SHA-256: 72f7713be6c21da6b229cd785d7ccebee06311ba3601a50e1dfa496b33047d5c
font_02_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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