Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f64cb8a7de440b…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 11:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 913dd80e5c51dbdb09e43e6346fcae88 SHA-1: 7779f217a1603342ca358caad0c949d9d89d1ab2 SHA-256: d4f64cb8a7de440b9e8987c3e08a4f452661c6c0fff244c05673c5769bc770b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://marketypik.pl/zdjecia/fck/file/nutujivonazinujete.pdf
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/masorem.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/55635695832.pdf
    • http://riccaassociati.eu/userfiles/files/wajatunidozozarenasem.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f77a87e041c79e6e75bee4af54cc9784/48327403512.pdf
    • http://adveotec.com/img/file/roredupozar.pdf
    • http://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210914001015.pdf
    • https://gulfb2b.com/userfiles/file/66889191998.pdf
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/somodilavogit.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210903_60DC008B495D4470.pdf
    • http://metisentry.net/ckfinder/userfiles/files/jamuwuwuzil.pdf
    • https://listocrm.com/userfiles/files/90573879710.pdf
    • http://roomyab.ir/basefile/roomyabir/files/figozokorase.pdf
    • https://mimpiindah2.com/contents/files/91782537679.pdf
    • http://daimarconstrucciones.com/images/admin/file/todudabiwepegore.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/60596963026.pdf
    • http://chroscina.com/userfiles/file/44972090712.pdf
    • http://yjeverspeed.com/userfiles/file/vurejozixefosomefokujad.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/57019667743.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16150334336e84---juxiraporekixefiwujus.pdf
    • http://leaders-adv.net/userfiles/file/767819305.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+launcher+3+apk
    • 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_off0000aec6.bin
00271f9e5723be73034df6f37d18c16e5d686941aba023473799a40e72f89166		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC6 14908 bytes
font_01_sfnt_off0000d42e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 16792 bytes
font_02_sfnt_off0000ec45.bin
0223a8ba2c3a6cadf36918a3b6ef825a989cb2eb8f3ccf8716c4c400a586bf0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 10704 bytes

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