Malicious PDF — malware analysis report

Static analysis result for SHA-256 d597cff90d3cf327…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 06:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fde9d9334bb08c95f97448fd1f522143 SHA-1: d3b60524226490475510835676ffdaa191d4b619 SHA-256: d597cff90d3cf327267e03cc9a1e8c52ca08a3e8995857e11b257031e3176264
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm on disposable hosting, indicating an attempt to redirect users to malicious websites. The presence of embedded URLs suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=alchemist+malayalam+pdf+file+download PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d59628f4503525bd03928a1638116dfa/70150729743.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/mijuzejiminepilomapej.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210906042000.pdfIn PDF document text
    • http://tchid.net/userfiles/file/26209682620.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/lumalotinazipurebamuki.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/35897236519.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/30682574168.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/831838620.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/22178567106.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/17685745776.pdfIn PDF document text
    • http://kme-kme.cz/files/file/39645139807.pdfIn PDF document text
    • http://prota.ru/upload/files/juzidogadarotijez.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/42859260470.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/80792253846.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/6184773511.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/98086083808.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/23442475894.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/26142820143.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/musisewixuwoniraxarosus.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/bakogik.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/91tjb53v5tap7kfkmdvk0ddjvm/banotodedufa.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/69856000634.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_off0000bd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 10964 bytes
SHA-256: dab05e7fa3c050e01b0fe939ef8f56b1cbba7093a83ebd8aa6f6ebe6eff711a6
font_02_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 17892 bytes
SHA-256: 171339ef93991da969357061414c3f0e7a72e28177c329a5879f43f33111b0cc

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