Malicious PDF — malware analysis report

Static analysis result for SHA-256 44376d960200796b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 14:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2464a8d667db52f334d00183dcef910 SHA-1: 02eef4d726618cfcad4cadcd6dc928033f04a659 SHA-256: 44376d960200796bae56e7479edc25eb0da2d439bd26a969f7eaa655a01e48ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are embedded within the document's structure and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with the URLs likely serving as phishing lures or downloaders for further payloads. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://catamma.ru/uplcv?utm_term=white+body+hack+pubg+mobile PDF link annotation
    • https://www.andreivieru.com/ckfinder/userfiles/files/binejofadopoxinikusowox.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/49752624016.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/89265545035.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/27114962760.pdfIn PDF document text
    • http://ijfbn.com/editor_up/10227432129.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091717255373499.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109041532398256.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6b46db96---wizisatixiboz.pdfIn PDF document text
    • http://etnorom.hu/pictures/11273753035.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/tuxesadumigozulokafodi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd48eb6e8---19724581076.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/fafevurixuwefipepizu.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95149916136.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/fifog.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/30605950394.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/nikewirider.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_off0000d1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 17752 bytes
SHA-256: 3013c7af6e7a2aa03ddf3695a02b2910100487bdefeedb09216bb4aed77b6956
font_02_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 11028 bytes
SHA-256: 200a5414cb536722d1486722993287a2b5461f475ca7ec7175e1768d5ef2eb1e

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