Malicious PDF — malware analysis report

Static analysis result for SHA-256 61218cb662008160…

MALICIOUS

PDF

64.0 KB Created: 2021-09-11 15:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: afaef99b159556ad531fc90d5c268e3b SHA-1: 9863b38415d54abc9a1071b4ac143061ba300678 SHA-256: 61218cb662008160f179f6c6b12922f0f32dc120782b18b2fac196d8f3e89bf3
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate the download of further malicious content or lead users to phishing sites. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

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://leavereview.com/customerinterview/ckfinder/userfiles/files/xapefojixedujutesojogo.pdf In PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/buwulobozutiliwof.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/19890431705.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/84839104547.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/vajisadakubow.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/wopolex.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/24315911017.pdfIn PDF document text
    • http://www.heksan.com.pl/file/fabenixedogugojuzilu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136801017be7---94302534553.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dadozaxibolagowe.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/ruxobuvazanuvew.pdfIn PDF document text
    • https://eetravel.net/file/molagux.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/tudub.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/zibidalosikopabas.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/dujim.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/fuzikikedimifubi.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/44950516594.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/42550511690.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109052345001221.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210911030905.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c970a468f6---49778160159.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/rukelajagafukovase.pdfIn PDF document text
    • http://savemaxint.com/files/file/pikelemafugerex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+game+ultra+kaiju+battle+breeder+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 11116 bytes
SHA-256: d7053e35721c987d56df92bcf82e631537abebd299d74c28bbfaa58d001b5aab

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