Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb23d47b7f5758dd…

MALICIOUS

PDF

90.5 KB Created: 2021-09-20 11:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9373cb67cbe6e66f1eafe028d870fb96 SHA-1: bab81d12c939fd091e6334bbc6d5cfe895af0b58 SHA-256: bb23d47b7f5758dd1a0243681c7950f888b6d53f12c86d7967108a0b93dc894f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to disposable domains, suggesting a link farm designed to host phishing or malware content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tucholainfo.pl/userfiles/file/32349235598.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d489d1dd9d---56563287011.pdf
    • http://kunmobile.vn/files/uploaded/20210913/file/47519856774.pdf
    • https://factorysales.com/userfiles/files/22369047081.pdf
    • http://goodfortune.hk/UpLoadFile/file///lalofexirezozoti.pdf
    • http://ozcetinler.com/userfiles/file/tefavexevigufitaxex.pdf
    • https://dampinggame.com/calisma2/files/uploads/73106111144.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fe52eb83---1048409532.pdf
    • https://signos.larrialdiak.es/files/galeria/files/82860671318.pdf
    • https://lochoanggia.com/upload/files/50454737760.pdf
    • http://garageanything.com/js/upload/files/43225529317.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/gaxid.pdf
    • http://tobn56.com/UpFiles/file/ritazomofidolixibur.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/bufosaberokebaxozol.pdf
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/sozukuxiluvaxekadug.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16310735945487.pdf
    • http://metalzilemboeventi.com/userfiles/files/73879022842.pdf
    • https://aluminiosarla.com/userfiles_arla/files/1495335170.pdf
    • http://orderbestwings.com/uploads/files/26221032725.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/38153738818.pdf
    • https://rajaketiga.com/contents/files/40194258245.pdf
    • http://myphamso1.net/uploads/files/delejosamutawipa.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/redejo.pdf
    • http://ambvet-trefontane.eu/userfiles/files/zaxatutalijizoxep.pdf
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomipat.pdf
    • https://fullgame.hu/uploads/files/povumip.pdf
    • http://gd-weimi.com/upfolder/e/files/20210910005158.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+clear+storage+on+my+phone
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/56601850119.pdf
    • 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_off0000f926.bin
a23ca5772c5fe5bda0da59fee1235967a6446750fe84d1b7d64c1502c008334a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 10920 bytes
font_01_sfnt_off0001124e.bin
6b5777758a5b36caea041bf9f1b0042b5e66bb77bb00b3a4a6e8d17ce2576389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1124E 19128 bytes
font_02_sfnt_off000143da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143DA 16792 bytes

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