Malicious PDF — malware analysis report

Static analysis result for SHA-256 427a3f4d98112f3e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-12 02:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 181e31b2ac557c24f5ffaac359a0dca6 SHA-1: 2c934c71ab0c8a111fb8041e26a99729171deac2 SHA-256: 427a3f4d98112f3e315bc949df244b806a007e22ca94fa1859b98ccf75299474
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

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.
  • 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://crysiq.ru/uplcv?utm_term=create+an+iso+image+from+your+operating+system+windows+7 PDF link annotation
    • https://nationalshield-uae.com/userfiles/files/rituxapeboxavelokojilifiv.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/wenisegejokopo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f52da61b85---webamadebo.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/82192337338.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/98530371568.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/93993217064.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/31724801003.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090316223453.pdfIn PDF document text
    • https://bauarch.bg/files/12147623263.pdfIn PDF document text
    • http://www.siposferenc.hu/html/22913103487.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/vivoxik.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/26004217154.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2bb5a2357507987a45c7d12abec04fde/gedodisaxabuxona.pdfIn PDF document text
    • http://sro52.ru/uploads/files/98960838462.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109010546146876.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/futazuv.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/96687110094.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/pemekimesudakiwiwi.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/gejivaso.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/repabipuwazelubarowodir.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/kapotafekaruvagetifivunuf.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/zanilemadonewiza.pdfIn PDF document text
    • http://soc-in.com/data/media/files/jefimemupibino.pdfIn PDF document text
    • 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_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 18732 bytes
SHA-256: b435e33396a29329bffce26e43fa6d7c7f35788f3aa5a5ed00d99306597e5c92

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