Malicious PDF — malware analysis report

Static analysis result for SHA-256 c487250cf716b0b1…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 19:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a84f053287bcef880214ccd2c4daaddb SHA-1: eeee4ffb117868cdb4c0fc457d34f11b94fd51e8 SHA-256: c487250cf716b0b1e8f094ee278bd7ab742771b64da7bdf932c08ac60414f800
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating many distinct links on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jawarakreasi.com/file/75186773251.pdf In PDF document text
    • http://slsnn.ru/content/files/95385153809.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/40544345888.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/beferosipuxafotovururi.pdfIn PDF document text
    • http://voijin.com/userfiles/files/24215886541.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/60206815490.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/3561100688.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16130a105a9bdf---26684170931.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452e6c3984e---jonudimulapotebufiwalovar.pdfIn PDF document text
    • https://eslms.com/userfiles/file/76407162464.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/59000069244.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/22925503401.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/665114fd26a25ed63404dc5144b03ff4/14215050854.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/54973516044.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/noroteribopid.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/91817609483.pdfIn PDF document text
    • http://aprt1day.ru/file/12440779607.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/lotufu.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/70680353198.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/96217659815.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/fagazadalural.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/54818550664.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109052000367774.pdfIn PDF document text
    • https://masihpt2.com/contents/files/41812181496.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/xagotamiwixipunafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=archak+gaming+websitePDF 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_off0000bd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD08 16484 bytes
SHA-256: 55b2564adc58b561b23719de279f104035735116148f4cc80274b8fb57cb5b09
font_01_sfnt_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 10808 bytes
SHA-256: 7ec7c99016e0677b073d5bf1622648642cfb86854a0bb9dcdeae989bc55d6497
font_02_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1