Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ef4cce923a665b…

MALICIOUS

PDF

81.9 KB Created: 2021-10-05 00:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ceee0f48343f91c75b36c36081abae88 SHA-1: 29e25eb9c2217853bd6d3de718472ed20c31a2e2 SHA-256: d3ef4cce923a665b59bc9dec3d699c4b4073b2b5e08e1bb247ccbf6255a2501c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is designed to host a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rheinfurth.de/userfiles/file/perus.pdf In PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/taxizalapa.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/forazaxadunofesezemikiso.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/fulesilaka.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6290024765.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/nadosilofe.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6b73c5534---66950760685.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/42532727728.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/14810267741.pdfIn PDF document text
    • http://wixoon.hu/upload/file/vakimuwenux.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/vejijaxuwimomebof.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/66563574460.pdfIn PDF document text
    • http://kdekdyjak.cz/data/vumufupowexarevomel.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/mijejekudawidinul.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d33bd2ce1f0758f2366cbe92dd02457f/62427438355.pdfIn PDF document text
    • http://oris-am.com/editor_up/mimosotafusig.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/4313980309.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/14156935145.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/pogunugamovifugutawe.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/resomemova.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/vozujotesiw.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/98468362891.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/fapukexolevujugoguzenu.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/ganuzibe.pdfIn PDF document text
    • http://scro.ru/pic/file/bigexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hagrid+and+fluffyPDF 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_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 18024 bytes
SHA-256: b2fd0c1b28a47f7b6f7880459f3789c53a635693f7b649efeccdd2cbd86fa115
font_01_sfnt_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 10216 bytes
SHA-256: 7384a6d164fa9f0c01227e5b813e9ff4d234273816112ebfa75a3ba9b0ea4962
font_02_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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