Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba11ae5c5be829a…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 11:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2df2c5d6f51befd31f092fab292e36cb SHA-1: 152fc967f3cccde704f182a1c203ff918066791c SHA-256: 8ba11ae5c5be829a36b41a976f1b8ea50408705b971c811875c3ce001d029582
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one specifically identified as an external URI likely used for redirection. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links to disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=apk+screen+recorder+download PDF link annotation
    • http://faptvmedia.com/userfiles/file/1020546662.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/ripifodulufilufoline.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/tudaguwifejovujupo.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fumuworelukalekov.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/fufexaxaxokeluxege.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/rakapogin.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/nokijalotafogikexebugo.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/fedada.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cc527c2e5114745093d4b1bd693e239d/7570526131.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f760ca9caf---kavoborasuvibazuna.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/kefadurig.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/dulipik.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/mutafe.pdfIn PDF document text
    • http://ciskmv.com/css/file/95113622545.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/55169217064.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/31719337593.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/mumazoju.pdfIn PDF document text
    • http://techmechengineers.com/uploads/32758547779.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/rodumo.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/34715867640.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/24701722071.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_off0000af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B0 10476 bytes
SHA-256: c1fc3a8534977541bd07c5cd467aa7c2db92e1d73aa6fa67ba78d0ff169dafe2
font_02_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 16092 bytes
SHA-256: 8b70df929017ebc840b8111c0e8619f3c64d9b47ac86c198d458719e2078a6e3

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