Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8e077d625833f4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 23:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0ae3c0533052672e66157e6b9c3e183d SHA-1: 1b4b564c7fc133ab6e587f353e5c2f9860ff2a90 SHA-256: ef8e077d625833f458a4a6a96706d65152669a36dfc7c803d88565eb5c5cba15
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, classifying it as a phishing trojan. The presence of external URIs and link farm heuristics further supports the attack pattern of luring users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=radhe+movie+full+hd PDF link annotation
    • https://cv-vezouze.fr/media/file/nuwaganenurinipidejonewa.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/4751524585.pdfIn PDF document text
    • http://svx.su/ffile/file/dojaliliduvafugimawoduzex.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/39918648335.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210903050910.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/47115981615.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/92455592824.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/vovumexugopegalinelewojer.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/wubeserodefobemisatelis.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/94263724002.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/36203002431.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/zegigani.pdfIn PDF document text
    • https://andana.us/files/files/45620468425.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/tijetisekupi.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090609035783.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/tuzokonelari.pdfIn PDF document text
    • https://titishop.co/upload/files/zolaxaligagasizavipewuvas.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/b0d229c3e453b8dff3e0fc3f40c3bb01/sisajuxetigejamamefoj.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/nerikajiximobob.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/kudivowuxak.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/648c04a34f4627634855a6a342480cd7/82035418800.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_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 17976 bytes
SHA-256: c54a63ebee0dc203e6b7381421be750f9e71e022f6a09f2bca786535f7e25bc8
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 10360 bytes
SHA-256: 7c8ecd54effdd3fc1b42a2b5842790652d1642e618886fb06d7a792b8f4762ad
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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