Malicious PDF — malware analysis report

Static analysis result for SHA-256 2850845010330bbb…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 02:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6690008b2811f3419b871f2d203ab3fd SHA-1: e4a7c73a8df3c24ca66a1f4e503632198fc88068 SHA-256: 2850845010330bbb80eab3f1ed493c72b3f6ecd1679cee29b6fd17708ed129e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, including one that appears to be a lure for movie content, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=jurassic+park+fallen+kingdom+watch+online PDF link annotation
    • http://momsystem.ru/public/file/fivivakafometokelaretalo.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/vipokamebifonomifizegi.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/86239078055.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/63524140263.pdfIn PDF document text
    • http://matras-devison.com/upload/file/42841010832.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/bejugidiwivexojuwamuv.pdfIn PDF document text
    • http://precisao.org/files/files/55849929699.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/87759726534.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/11948879733.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/guterufajejaxa.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/xemivivijozitom.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/52009330907.pdfIn PDF document text
    • http://skupka54.ru/upload/m/tizenibofizorosepuxa.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/17097917230.pdfIn PDF document text
    • http://retailcop.ca/files/maliboboza.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210917_8EE468C87C1FB30C.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161329a846a7e0---pezajalusemes.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/23939280026.pdfIn PDF document text
    • http://vaynhe.com/upload/files/58989961902.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/26687719264.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/68211158237.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca0a8f1ad2---4578857953.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/82485234709.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_off0000ace8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FA 14516 bytes
SHA-256: 06b1f896c8ec700b09b3d9ce1ec19d61f79b9be4599301e4f9bb942424e831b2
font_02_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 11336 bytes
SHA-256: 1cd05c6024b985253ce690358310b27d1a60ba61030e02e78aae0d8eb4e661cd

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