Malicious PDF — malware analysis report

Static analysis result for SHA-256 8475aa3144745f96…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 12:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe0b9954e91e27cbfac56d6d49d8d840 SHA-1: be96520b1696f9752c73c89cee05edb7faa23ebe SHA-256: 8475aa3144745f969d66cd2d503c15f26cc7cec137fa05dbbe82353b1daf952c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis identified numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself often facilitates the delivery of malicious content or redirects to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee4bd281b1---36514079805.pdf
    • https://kaplaitalia.it/userfiles/files/wikinekujudojimudeterome.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/78246337803.pdf
    • http://custom-mugs-factory.com/uploadfile/files/lepox.pdf
    • http://wittlich-luexem.de/userfiles/file/tazasapipoliradu.pdf
    • https://hoalavender.net/upload/files/15850803544.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/jipuxomatoxuf.pdf
    • https://vatlieutaphu.com/upload/files/30446997806.pdf
    • http://vagtteam.com/userfiles/Files/bedavarabufibixesuwiw.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/849fd54618a8c711ed2533d95d836dd8/pevuxaxilozapimego.pdf
    • https://sssmri.com/ckfinder/userfiles/files/sivajepon.pdf
    • http://ge-mak.com/files/50056505469.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/pebilevoluzifapapiv.pdf
    • http://fairfresh.net/assets/admin/ckeditorimage/files/53089512506.pdf
    • http://volareinmongolfiera.it/userfiles/files/77134185455.pdf
    • http://torgoborud.org/images/file/bugipolesevewejazebuweb.pdf
    • https://partnermind.cz/images/files/wibamirabowuzipaximebiduf.pdf
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/zinenipitakisirirep.pdf
    • https://careersourcechipola.com/files/public/xolufitagosesonunolig.pdf
    • http://studiotravenzolo.it/userfiles/files/tujiwa.pdf
    • http://ttmplus.com/userfiles/files/tadobezeviw.pdf
    • http://nhadatv.com/webroot/img/files/33662694680.pdf
    • http://labuchedeberce.fr/userfiles/file/remixaweseketarezus.pdf
    • http://cs-web-design.de/ablage/userfiles/files/18496039310.pdf
    • http://azstorestudio.com/uploads/files/46540135952.pdf
    • https://anmoul.com/userfiles/file/64217951784.pdf
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/bepafupezo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+read+books+on+kindle+app+for+free
    • 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_off0000b552.bin
749a97e63550b7688fbd4ff371dec7a3eb4cc858ec40a2766ed9089736d6e611		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB552 16664 bytes
font_01_sfnt_off0000dfed.bin
d48cbab904e47157ba1fb08013ea97d2500d85fdc215c433c7127c1d570fffbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 10800 bytes
font_02_sfnt_off0000f8b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 16792 bytes

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