Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd4287460d88546…

MALICIOUS

PDF

81.2 KB Created: 2021-10-06 03:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: aff4ec365d5497d339130b40cce4983d SHA-1: 85d9454628845563fe5596943f1ebf76f4eb6df8 SHA-256: efd4287460d88546bacd42bf672d173c787e8dd0664ffcc31257d0d0b45433c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct domains, which is a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://investgeorgia.ge/userfiles/file/17320116566.pdf In PDF document text
    • http://sportservistocik.cz/UserFiles/File/xogulejakupubo.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/buvunukevejalulerepufe.pdfIn PDF document text
    • http://agama-rc.com/upload/files/29775203658.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7c7a56d78---67428129850.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/82154129872.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210919030217.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/79413287643.pdfIn PDF document text
    • http://teledirk.com/d/files/kujofatidesol.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/sebidolowikegukofoniv.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/73245992659.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/sugejusaluwapus.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/moxetuga.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/renevutamagif.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/61469204857.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20211004_CCD4A6ACFF32EB3C.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/dulifujupev.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/86339465507.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/xemitarerim.pdfIn PDF document text
    • http://delve-cr.com/uploads/88726223306.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/pelimuvonekiba.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/29619643418.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/8026395657.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3ab20f5bc6cd1a7302a4eeb9c5ac6a8c/mufoxinovarokovasewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=different+rotation+and+revolutionPDF 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_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 10344 bytes
SHA-256: 15d3f3f1c08d7d3ba627ea1d488389f9b265a986c733ac7de3fb7b4431c82138
font_02_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 19064 bytes
SHA-256: 587d4250f399475b8865a61fdf5feb444a214405da592bb26edfcc169b1f790f