Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ce82ae079d921a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 20:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b404fede673f847af15b716d2f2c429b SHA-1: 94ca905072365de529c85a21d28e8c7169683076 SHA-256: d7ce82ae079d921a3d50b97095902ce167a17250b3c1f06091797928ccf36fba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially disposable hosting, suggesting it's part of a link farm or phishing campaign. The embedded JavaScript is likely used to redirect the user to one of these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d1b82dbc---zikebikabigagitenadebare.pdf In PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/3810338098.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109060301242492.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/pubevewejipebalozub.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/wepitipibi.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/gerubukejijibivadizobu.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/56451651825.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16137528fc1ffc---55761121200.pdfIn PDF document text
    • http://mcutech.net/files/vozof.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/18653815323.pdfIn PDF document text
    • http://etre-belle.su/images/file/dozefidifavase.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/84570517688.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51f428eba---68546243055.pdfIn PDF document text
    • https://2winit.com/Files/files/70814789571.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/fejewatusabog.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/dasawotezol.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/vonudokuwexagesetomuvu.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/77409974358.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/betigokefamiga.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/tigexaxapavi.pdfIn PDF document text
    • http://intertribo.sk/files/48473908299.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/dipupemuboxedimej.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/tamuxosir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=benim+hocam+tarih+soru+bankas%C4%B1+2019+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_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 18420 bytes
SHA-256: 41e81b906a2d8d2ad94ce592ae8c6789067066b5bdeb368d4dd7033161045628
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 11732 bytes
SHA-256: fc93272dd04b38871da3533d1a295a63d21d630e2fecaecc08f8dbae9d7468bf

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