Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b636c265987328e…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 01:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad3ca478f02df52ee6a3351490c30d1e SHA-1: 30572bda31909312c630354c4eddee13ac7443d8 SHA-256: 4b636c265987328eed383ddd9ebae1074a741ce300c05d2364f3997388590014
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high density of links pointing to potentially disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

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 http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44999266196.pdf In PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/48574872337.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e42129492b---rejirogaz.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/josadogujot.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/vavewo.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/zanonoxoranelufakut.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tegijosazakudokekuniduje.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/90955225976.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/xubufafilosedis.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/bakokawetap.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/37953884468.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ok2j5sve24cdiuhlbuonmpochj/13934615836.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/50080245777.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210904060459.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/8dba256bae89ddfd6a7607488f624c6a.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/15103940411.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/pebuvamavobagakilutakat.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-7/20210907230223251808.pdfIn PDF document text
    • https://akemi.ro/hirek/file/71166547705.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/xivewudawemom.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/97413571345.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/tugiso.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kupakewakosebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=adult+finder+loginPDF 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_off0000bfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 10280 bytes
SHA-256: c235333efd225cefbb005e4362fa32defbf11bc59369d87af31abd6813b039d6
font_02_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 16744 bytes
SHA-256: a43ed2e323d5cbdc7e112ae7384defd61d26f63e4ddaeece1d611783cb110f6a