Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3f7d593a774594…

MALICIOUS

PDF

77.1 KB Created: 2021-10-04 14:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3f09e6c74480d243d33d405489bd84c9 SHA-1: dbda8c468907194ffb3bb74f0fd7e7634f4e384e SHA-256: 9c3f7d593a77459412686a730cf9001c0199b034c9bdd938032a04be3aec3292
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://synerhu.ru/uplcv?utm_term=xinmeng+keyboard+and+mouse+instructions PDF link annotation
    • http://podlahypilat.cz/admin/file/fukivobojazizefumibarijev.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/sasavixur.pdfIn PDF document text
    • https://afayl.com/userfiles/file/mefarekap.pdfIn PDF document text
    • http://hueide.com/upload/files/nelabewuwamibisugezasu.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/59599708109.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/pulerozib.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/63965650565.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/1912260989.pdfIn PDF document text
    • https://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/1615260182da25---5551445685.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/karitukorepiwozoka.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/16e0328c6f3d7b282634c9b8de9f628e/39347426621.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/nedilubosunorubevare.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/26435408573.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/34164986652.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_off0000c815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC815 11120 bytes
SHA-256: 08d861377eab1813c0aa26b4d95e2f6ba22d402cc6ab64f6ffd4807e499e88f5
font_01_sfnt_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 17772 bytes
SHA-256: 119b0a1e1fc83941d86b702bcaa419e4663eb0b1833acfe4228608bb91af8e31
font_02_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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