Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e1b3b0bb613715…

MALICIOUS

PDF

69.3 KB Created: 2021-09-13 22:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dae2b85c97ca89929e925a70386e5ba6 SHA-1: 28348b08a6bdcd7c195bd98c961f7984f5fd9bef SHA-256: d1e1b3b0bb613715ad51decf1154d9cdab0e72b01adf5e6b86eb341f40492ea6
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6872

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://oniceh.ru/uplcv?utm_term=homescapes+unlimited+money+and+stars PDF link annotation
    • http://polins.org/public/userfiles/file/satibir.pdfIn PDF document text
    • http://signauction.net/userfiles/file/20563562271.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/zajojujowopate.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/60190577480.pdfIn PDF document text
    • https://rajaunited.com/contents/files/87292376082.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96efb9cbf---vijadozivegesudozevegozad.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b94b511eb---mewegirerovagetigep.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/bemikuxifenupidixiburud.pdfIn PDF document text
    • http://matras-devison.com/upload/file/26718747444.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/zixevapomuvesemigadofu.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/nevopo.pdfIn PDF document text
    • https://ijpdua.com/contents/files/77410942599.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/63672658750.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/241801_reregikiruka.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/fexazudubev.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/vajiwe.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/kanexutijosigato.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/mumakukezil.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/32940676342.pdfIn PDF document text
    • https://zzhqhi.com/d/files/lofexasa.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/xuloxafopiliribebog.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/93953554469.pdfIn PDF document text
    • http://gro-felix.si/uploads/sebasati.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/xidovugisatisitogaji.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDB 17348 bytes
SHA-256: 7a54a4c7ae67cbd5728ef5d408cb78b46176cdfeb970ed3222b0d799cd62aa73
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 10880 bytes
SHA-256: bb6e1bc199292b4a1c36f312cc73a27dc010ffee7d8ff298fcb391ced5370bb6

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