Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cce5b8b84883020…

MALICIOUS

PDF

72.9 KB Created: 2021-09-21 05:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b251b652815117b20675dd0217db645 SHA-1: 6f2316076279549391e5ccf88a787482332b737a SHA-256: 5cce5b8b848830200ce213f0018094302ffc24ee08a6fd1507d2dbf72098b8fc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF's structure as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://hdurmuslar.com/images_upload/files/nizalafebomeligadula.pdf In PDF document text
    • https://aksusu.com/upload/files/69233838637.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/novevifuneba.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/96067953104.pdfIn PDF document text
    • http://tzsunup.com/upload/84951429271.pdfIn PDF document text
    • http://chemicalengineers.ie/images/9309562133.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/66540871708.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/bobegelubifakurevikaxofe.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/tamojurozi.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/jadodi.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/41112712879.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be3b7f0b7e---kazodukake.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/ramolu.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/xitivuse.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/57132965551.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/donojubavi.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/68416237296.pdfIn PDF document text
    • http://alvitraders.com/files/wajulufow.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/gerakoduzeve.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/66668232962.pdfIn PDF document text
    • http://generaldistco.com/images/file/86802044789.pdfIn PDF document text
    • http://dd-eng.com/files/files/divudirunepajel.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/somosipepowekim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=el+club+de+la+pelea+libro+pdfPDF 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_off0000b70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70E 17820 bytes
SHA-256: 135848aa0415703800b1363bd341b85bbf2994f3aeb4384bd6826893e7294a71
font_01_sfnt_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 10464 bytes
SHA-256: 5dad1378a0f9a06916c5a7c1728ffc353b2f2018b72ab0e7010030032a70d796

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