Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7861f5b7fbfdd6…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 10:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2240324cf14e0e826f4e7bf64ed16776 SHA-1: d2f9756f21f907ae609407e34f202f444adf0d4d SHA-256: cf7861f5b7fbfdd6d5c828966d1a75f5e893e07e87f46233d1b10802a2e9225b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains or are part of link farms, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=drag+race+thailand+season+1+online PDF link annotation
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/terikadimuvojoza.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/96486117574.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131b6b5e13---32448669058.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/93958101553.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/bikulazam.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/dexosobazefudekixob.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/85578760101.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/25986267924.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/31549432977.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/xinalebaterozorar.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/dikuxa.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/97827871774.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/98216255441.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/futomodofovoj.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/39890857073.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/55065738967.pdfIn PDF document text
    • https://esz.jp/img/editor/files/kaxijidumonikelikosudofa.pdfIn PDF document text
    • https://jurad.eu/files/file/4406622115.pdfIn PDF document text
    • https://guijek.com/userfiles/file/kexatulunerobisator.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/73918772816.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/kediko.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/43432504444.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/xewujogikexipolitinab.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/86483379854.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/wubarozazuvizu.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_off0000ba9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 10700 bytes
SHA-256: 57057c41a61706b4429f8c9222b461d6d920b29ce3a8bf2cee119f777e5aad89
font_02_sfnt_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 17012 bytes
SHA-256: 2c00efe82fc81cbb5916f3a853f1998941ccca6c482eba2c346c182e04951be2

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