Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea91ef783e935c2f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-10 09:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 629cf36ad4ecafe40849eba369d7da2e SHA-1: 92041006f5ad974ec9349a113a99e3ce176254a0 SHA-256: ea91ef783e935c2fa52498731a7511753e7a6afeb70670cb3940e8f8e171a342
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many associated with link farms and disposable hosting, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=leibniz+rule+integral PDF link annotation
    • http://ge-mak.com/files/josubag.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/38536714401.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/a8b272fede16f79d579f2cd986b493cf/19720812941.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/49192901746.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/zejorasixowi.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/vedorusu.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090201151423.pdfIn PDF document text
    • https://ferropula.hr/files/78554009660.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/66830107216.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/46271630769.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/89373688733.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/98781455188.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/7201367260.pdfIn PDF document text
    • http://briztravel.com/upload/files/59093741271.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/22871537386.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/46676919135.pdfIn PDF document text
    • http://plncse.hu/php_data/file/70253272502.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/lazuxamodipotaxinozidixe.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/fabuwosajulovitonej.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/kotasug.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/58635560694.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161391a81b75bc---wadafi.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/wefovexevog.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_off0000b507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB507 17520 bytes
SHA-256: c7cb29347c883f6c0eff9e97fd3681c902efbdd426a91f58628cfe1b064cd67b
font_01_sfnt_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 10252 bytes
SHA-256: 4519a8eb914903752a1d3efd400c7a0b76b27449ca9f709d91f86835fa1927ca

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