Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ae53a17fa46538…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 19:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd5f756ebc01aa5e5cd8a1df8872b78a SHA-1: 93a63a8e0d2e13890cde053425ea47afc2016842 SHA-256: f3ae53a17fa465382024c46d8fdecb3684509b028a835b18c2e7eb1daeccd953
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a link farm detector and a machine learning model, indicating malicious intent. ClamAV also detected it as a phishing trojan. The embedded URLs, despite some being marked benign, contribute to the overall picture of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://citadelcaralarms.com/userfiles/file/niroraviruxepe.pdf
    • https://eksiliotomotiv.com/upload/ckfinder/files/dakiteviroxitafakegami.pdf
    • http://artstudiodesign.it/userfiles/files/58262122382.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/48fjav7k9finkqobudji6hmf73/tudiselejutofep.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pepozitoruwitafijuko.pdf
    • http://studiotecnicomancini.eu/userfiles/files/domizegenazugerolusiz.pdf
    • http://tokyosushilohaus.com/uploads/files/tabenumiku.pdf
    • https://amigo-shop.105h.net/upload/files/5358019383.pdf
    • http://sm.ac.th/ckfinder/userfiles/files/95548072738.pdf
    • http://birizgardenhotel.com/userfiles/file/94068094887.pdf
    • http://stnicholasway.com/userfiles/file/5042780891.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/katadonunilez.pdf
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/weguxobirufiba.pdf
    • https://samirkumarpaul.com/ckfinder/userfiles/files/pewiworopopagariteniruda.pdf
    • http://johnmarzillier.com/ckfinder/userfiles/files/dafibobasofejuvo.pdf
    • http://h-p-n.fr/catalogue_dynamique/file/zafivumawogefomasorug.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c7a6db92---wumuvetileravo.pdf
    • http://hongshengfish.com/uploadfiles/2021091408495085001.pdf
    • http://oa30us.com/userfiles/file/bodajuredenirawonimux.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fazedu.pdf
    • http://baove247.org/upload/files/wugos.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/firenijesoreloxivepikalif.pdf
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/88339192752.pdf
    • https://edarky.net/data/file/36167226113.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fireman+sam+set+for+action+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC52 16792 bytes
font_01_sfnt_off0000d464.bin
555a736c8871272baa7b9a37545c5e2d14ffcfb68423a0f383e82819e9474bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 16380 bytes
font_02_sfnt_off0000fed7.bin
c13c8118003fa8b65985872cba0975926542f0137e48ced5dae586dd56ea1d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10840 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.