Malicious PDF — malware analysis report

Static analysis result for SHA-256 425f4541abcd2207…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 18:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cde9e35422c669f5a2d778a0f788500 SHA-1: c97952bae0582d93c4f66ec141343c2c18996402 SHA-256: 425f4541abcd22075d6d4623df9755e9aca2897aab49dff4ecc317595989f0f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using numerous disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://huntic.ru/uplcv?utm_term=st%C3%A4nga+av+appar+android PDF link annotation
    • http://malopolskiszlakwinny.pl/upload/File/toladorikamurepiwizaxula.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202196025412101.pdfIn PDF document text
    • https://unitjaya.com/contents/files/vabobarubi.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/sobobagut.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/73268684435.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/39390288921.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/71160466257.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/vilomilubudedozofuru.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/fakibosuzagu.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/385477277.pdfIn PDF document text
    • http://indemo.pl/Image/files/vejovebaxot.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3359c66c---rutewevojasawiwagirimo.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/10381435650.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/gubilozonexixuwin.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/28911837154.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/lebot.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/53258762962.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/40379623319.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/babis.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/powuw.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9aeac5a2d---lovuluk.pdfIn PDF document text
    • http://cpviettin.com/upload/files/kufuxoporanotosanofule.pdfIn PDF document text
    • http://195exim.com/datas/files/94176413355.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/40191115577.pdfIn PDF document text
    • 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_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 10620 bytes
SHA-256: 1c42f61cd85195977d1dcb77050c25ed93c05506c6028eebc81fb83d2a368c8e
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 17416 bytes
SHA-256: 29fb9a0ba23e2d07cb3f08dac19921d2d9917902b755303fb001f3a87e3929d9
font_02_sfnt_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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