Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8b3c91b27b369a…

MALICIOUS

PDF

70.3 KB Created: 2021-10-18 10:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a132442acc2a6f84cdf52d824fa6b078 SHA-1: 187338d1d4b77ae3c2942c626ec86458d75c939a SHA-256: 7c8b3c91b27b369a81d06a5c7043ceb5f50721b8683d8344a935cba2bc4ba334
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to distinct hosts, suggesting a link farm designed to obscure the true destination or distribute malicious content. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

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 http://superfasttv.com/uploads/files/90903906077.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf0ebfeef---72406006937.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/wavuwugigafudifo.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20211012190457_vvs1m3.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20211016013416.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/41479455615.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/44796625124.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/nivowewasagifaravo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161434cf32611f---bimoxiwixexafeweko.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/ragifumodijawuzowigifim.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/xetakudo.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/nuwitesefefotopufot.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/tepasivegowalevoboxu.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021092219502684.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/32847884804.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/7943515722.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/foragonip.pdfIn PDF document text
    • https://taflanelektronik.com/img/userfiles/file/95911647830.pdfIn PDF document text
    • https://maytuixachanquynh.kimtuong.vn/isc/public/files/fckupload/file/letisusufimoxa.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/dafevowejumijawu.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/69541765001.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/3167264816.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/22684982952.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=shareholders+equity+includesPDF 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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 18644 bytes
SHA-256: 4d853d2543ad65dcc6e5711ceccf067b1a14c8c3ec4a45cac2714f779667622e

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