Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6033d99ab5fbf9e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 04:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c598f54d9d8293122d73290db3f092b3 SHA-1: 94e190a91df910fb7451afe0d4f16f1b4cc75f09 SHA-256: c6033d99ab5fbf9e81f10e2eff3f15ebdea6c6a3b387d7d3191039c9244da830
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 form a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The presence of external URIs and the structure of the PDF suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

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 https://archism.ru/uplcv?utm_term=illegal+movie+streaming+websites PDF link annotation
    • http://ivelinabozilova.com/userfiles/file/kivajovizulajil.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/tejigugepaxogitotab.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/pobifijuradafesuto.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/ditaduxudodilavilunimem.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6bdc19bf---18569128465.pdfIn PDF document text
    • http://kodemari.info/data/files/gewinuvel.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/gejipusosavulisutibi.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/41674188756.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614900bc06e63---33046990359.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/peranovanene.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210902_B2958ABA89EA6259.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210926_164939.pdfIn PDF document text
    • http://klemanpince.hu/files/file/38072122428.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/xabusawakulebube.pdfIn PDF document text
    • http://pneusmarene.it/images/file/zitepogepilusojonaf.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/86022485860.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/68402892241.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/95033017822.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/14363286423.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/13543864231.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/vilapime.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/falosagira.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/41651583877.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/tuzewipasabevakem.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/26754798293.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_off0000b52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 16436 bytes
SHA-256: a2f97d40b2526b15c14f7c140cb1928f02d574da2df15a6d09e1988e9e9721e0
font_02_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 10692 bytes
SHA-256: 0662be06ebfc8e3b069f761fb70e71ece6806f241feb40d0569547c23716f061