Malicious PDF — malware analysis report

Static analysis result for SHA-256 116113c272fca9f6…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 05:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61f00dcf557683b63504602ec57df04e SHA-1: 1349f552d5952489de8faf86d0697881f919e022 SHA-256: 116113c272fca9f6f85d7b0de6babc046d69592e3b4cd67863064f49ac9f6efa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to host a large number of links, potentially to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cructi.ru/uplcv?utm_term=satyamev+jayate+full+movie+watch+online PDF link annotation
    • https://esprimagroup.com/userfiles/file/mokowija.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/pupaxupowa.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/xozagafobun.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/97488355496.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/34415397696.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/nuzulomerawopuzukuliw.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e0a2c8749---nagokol.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/nogujajupa.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/ravoxagozanedigukopozodub.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/nazakikike.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/tewajemurapomixizorijeriv.pdfIn PDF document text
    • https://titishop.co/upload/files/rafovofowila.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109121916507128.pdfIn PDF document text
    • http://nscenter.cn/upload/files/57819223192.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/koborexuwuz.pdfIn PDF document text
    • http://rem-proekt.com/f/file/duvuburapetosazuve.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/51065189398.pdfIn PDF document text
    • https://successalpha.team/upload/files/boxosuzidevuferabotus.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/61222736276.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78d28be0b---51563911019.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/nupexaravim.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191200297892.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/13421354762.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/38795942503.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/saworibinotejokap.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/gajezafesazoxulubo.pdfIn PDF document text
    • https://ubranni.com/uploader/files/48356920532.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/96134296602.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_off0000bbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC1 10904 bytes
SHA-256: ba55911814879b96c57af8ce842052025f501d049e97cb27262e96ac77e5cb03
font_01_sfnt_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 16652 bytes
SHA-256: 52f439e996b25168dad0594bef6e13c9cb1e145f9b00d4ab912a9f2a86efbec6
font_02_sfnt_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1