Malicious PDF — malware analysis report

Static analysis result for SHA-256 429e33c530d07332…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 08:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef42e80a0ba6870ed0d8b22fcfebc97a SHA-1: 8b182d2becadf846d7ace2e304b858cc1b3ba1fe SHA-256: 429e33c530d07332d7c0665049eff18b168a2876f602c72918fd22cbcaa177e4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate this JavaScript is used to redirect to external URLs, likely as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9367

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 http://bibrka-school.org.ua/ckfinder/userfiles/files/livojemevovevu.pdf In PDF document text
    • http://lidaoxc.com/upload/files/buvupafuzeguvidi.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/dofabuvosenevudiva.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/zasujulomuxugububad.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/97513996371.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/resuraredetofadufudivanu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161391c4c97f01---leludolizomugatedipedexe.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210914122608442697y3s5us.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/57646705439.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/vizufijovewolixotu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/gubusifaloguduwezanuvepow.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109171251329566.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/fapunamegoxavudarori.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/29947692480.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/vanekafupuvejulifixipiren.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/52751649802.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/tibapuralituvigavinuzu.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/xenelasidetimis.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/93258781302.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/dixajisixidizelenifegom.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139067634e02---lakadabeziwamobelalikoza.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210904034614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=weak+core+musclesPDF link annotation
    • 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_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 10280 bytes
SHA-256: 2d1e940630d63534c24f503c71ffbbcf72aa0f83b4c3e8810ac7f65bc6340b0d
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 17592 bytes
SHA-256: a501ed25025816a5379cd22c37b08fff8a877eaddee639beca836853949c8c20

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