Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e222fcf23a14b9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 07:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a99d9cf70a1b35979ca4758a2a9b5b35 SHA-1: 1ee8d6f76568905e54fb6ff3f9849da5b6cb9963 SHA-256: e5e222fcf23a14b93cf9dcb341cfffbb5026ede350a1db721ea59963b075c3b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and functions as a link farm, directing users to potentially harmful content, such as the URL 'https://coretry.ru/uplcv?utm_term=thor+the+dark+world+torrent+magnet'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to obscure the true destination by using many distinct, disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://coretry.ru/uplcv?utm_term=thor+the+dark+world+torrent+magnet PDF link annotation
    • https://dyaa.club/uploads/file/27597292139.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109141355345738.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0929955d---91442510765.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/48001672323.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee46662f41---palaloxi.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/noxaxuf.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/33944937028.pdfIn PDF document text
    • https://beltamas.by/content/Files/48211694747.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/lilexov.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/gugapopekiwifegoliwid.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/pegavodorefazuxada.pdfIn PDF document text
    • http://trubaopt.ru/content/file/45594579423.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/081511068953.pdfIn PDF document text
    • http://strahyi.ru/images/file/suboxexukot.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/85842295553.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/wepixa.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/lubajopigefezow.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/ruxag.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/faxuvimone.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/rimalamolox.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/gazapujub.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/63872396332.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/fabobibobupi.pdfIn PDF document text
    • https://hsse.cl/files/fapulosunumatobudi.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/tebarutiga.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 19460 bytes
SHA-256: 7e102e17e592718bae716f19ab804fa0cf0de2697cb3f30f8378e19cd44f4a99
font_01_sfnt_off00010e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 10576 bytes
SHA-256: 7d3fdfef4d1697c9f99bcd9fd73a1feeaa75a7f1dc3b99a0ab3bb9569ae374b6
font_02_sfnt_off00012637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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