Malicious PDF — malware analysis report

Static analysis result for SHA-256 79412d443f5f8a62…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 14:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc3c3bed1eb5fe08e32ded3ea7ac8429 SHA-1: c348bf92640413867046126464e9807316f2dd04 SHA-256: 79412d443f5f8a6227a972bb0b6bdaf9ec6f0b7f57b53574423a41daf444fd14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and the presence of many external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://htijsr.com/userfiles/file/guxowu.pdf In PDF document text
    • http://www.ujepites.hu/userfiles/files/64321893741.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/fozazeviradebuzujuririf.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/xejazironibelagig.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/tojupavizugodadesakeb.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/dudefage.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/455964563613b23d8db8cb.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109010635456861.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/75309586734.pdfIn PDF document text
    • http://tochuchoinghi.org/files/1902699345.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/sonoza.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/fagaxukorijisi.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/fudewubujo.pdfIn PDF document text
    • https://arerp.kr/data/file///75907168122.pdfIn PDF document text
    • http://wjcopy.com/upload/files/pikemasoluwosisusenoz.pdfIn PDF document text
    • http://podarox.ru/public/files/51325593568.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/tamez.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/47652895974.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/bujenuleni.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b290c76761---84949311439.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/sogaxavase.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/ladafulumupovorafa.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/43246404968.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/wifalipus.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/77189498576.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/28289829042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tyler+the+creator+roblox+idPDF 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_off0000bcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDE 21772 bytes
SHA-256: a6a6feb6e08bf822982a72c1b367e4ff7062894bb17bf69d37189a15d44aa804
font_01_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 10516 bytes
SHA-256: d21ef250e1cde49d3e5a99be962d07453ed2e5c47433a5e9d4f96436aa1140ca
font_02_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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