Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd9b67ab6199f01…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 20:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff9b1a689663391cca2fceeefafec098 SHA-1: 92a8b1ffd5b5e0e79098efbbb4445d66cf323e1f SHA-256: 0cd9b67ab6199f01c8cdc93f9a5fbd7c644dcecdf17a3083753b1008f9852f15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of numerous embedded URLs suggests an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution attempt.

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 http://batistar.fr/userfiles/file/nekuluwa.pdf In PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/79314090718.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/3734492118.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/58577780098.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/rebujuwapomosot.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/11788284694.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/nadawigoserelijokenixur.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/70672385455.pdfIn PDF document text
    • https://ivanamihic.com/files/65059514697.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eaebe0d6d---bivinasapenix.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/337428097612fafa8874ca.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/90239707980.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/25983946806.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/71033283446.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/22489721018.pdfIn PDF document text
    • https://latework.cz/soubory/87569885720.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/nomaw.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/binegibekojigu.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/90433697262.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/81127926212.pdfIn PDF document text
    • https://latework.cz/soubory/ponojojon.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109091251558658.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/nutemoz.pdfIn PDF document text
    • http://nemochem.cn/upload/files/gujovefutebipatel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+wooden+house+design+minecraftPDF 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_off0000b700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 11116 bytes
SHA-256: 62811cbbca1c4704ce6c5ea252920308b4c7ffa2136d4b604d9650c1def09f2f
font_02_sfnt_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 16204 bytes
SHA-256: c2a5a6dc9b66bebaf037eb8d2dbdfacc226d3d7c7990a10ddc58a20fe61ad093

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