Malicious PDF — malware analysis report

Static analysis result for SHA-256 55eece3e94555bfe…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 18:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8ca80b316bf56e257cc9d5012ae564c SHA-1: 9029bad1143aa1b2de855f4848c4e47e6e296d03 SHA-256: 55eece3e94555bfef2994c5a92ea10e45a673c2507d7a7f8a4cbb259150fb3f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to malicious websites or download further payloads. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=o365+smtp+setup PDF link annotation
    • http://kuhomania.ru/ckfinder/userfiles/files/perexotatopofurafo.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/sesinuju.pdfIn PDF document text
    • https://red-adlay.com/upload/files/83131925704.pdfIn PDF document text
    • https://emenu.hu/editor_up/kuvavukuze.pdfIn PDF document text
    • https://sim2007.com/files/5544604394.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/45352993505.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/44455368132.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/69742929453.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/29121619580.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/53939166812.pdfIn PDF document text
    • http://moretonassets.net/userfiles/zubujurapavagi.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/853907590.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/98831551488.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/pesetefoxuzovomubelib.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/jumufaxala.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/98269286742.pdfIn PDF document text
    • http://wamer.org/userfiles/file/bikivepimupidebejugi.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/34758204649.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/wibifupixowu.pdfIn PDF document text
    • http://pactolous.hu/upload/file/80369492434.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/35777486206.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903013208.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/93515303206.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_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 17704 bytes
SHA-256: 8112bdf10ea47eab7b68625b901c64cffbd7175ca24fcac4850ca8fdf0e0df9a
font_01_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 10388 bytes
SHA-256: 7fde906921ff5f59ec700a02a2a042de185771716730439d1fce0256028e4d7d
font_02_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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