Malicious PDF — malware analysis report

Static analysis result for SHA-256 3368c6f55877ac95…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 09:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f7a29be7edb0091a174a4176de429cc SHA-1: a33b72d5eb63bf8717f1f6814894292b36234b23 SHA-256: 3368c6f55877ac95950d0201bc69f463da6b29a850b601748136f3c43019b9a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files. One URL, http://torgoborud.org/images/file/75964999377.pdf, is particularly suspicious as it is part of a link farm hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://torgoborud.org/images/file/75964999377.pdf In PDF document text
    • http://www.gamylai.vn/uploads/files/vevanep.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/lijuvedifewifi.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/jogalari.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/68278760092.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/wapun.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/famexigemikeposejobeve.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/xosezixo.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/zisafojaliwuwejisuwa.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/25974664506.pdfIn PDF document text
    • http://dakov.hu/_user/file/48585149797.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/bugofuvoxuvikiwuzenowitap.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/23083916060.pdfIn PDF document text
    • http://wixoon.hu/upload/file/rimuwop.pdfIn PDF document text
    • http://thevale.us/userimages/89338147040.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/feb2750fd38ca2fb20c93f555e15922d/kofogide.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/reragelufawerorakeroj.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/98242630958.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/lufififefobumowobeko.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/xezajexebi.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/36133844395.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/86478355274.pdfIn PDF document text
    • http://heizler.hu/files/file/31283711779.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/lilupewupopipove.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/tinal.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161344f0718c8d---62558346132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=chinese+keyboard+on+phonePDF link annotation
    • 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_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 10724 bytes
SHA-256: 291969b752b08a22993e2e18265350a0a5b7e20b0b047242bf0b6e6be2c16936
font_01_sfnt_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 18504 bytes
SHA-256: f6cd56249888b700a8d248e5e5df5909d9c824748a05428bccb861cf47356e08

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