Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f3b0e0c250ce9a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-14 01:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e24918c8873522a6d0e75843fbe248d8 SHA-1: f41859f6f2aaf2b825d07929e7c8bd26b98e96e3 SHA-256: a1f3b0e0c250ce9a928c163fb0c8134e971142eee124309f7fbcb5b53e8235b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://makinsushi.com/uploads/files/60235902466.pdf In PDF document text
    • https://birudongker.com/contents/files/80565256801.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/68800700905.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/gamal.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130f663926e3---gexodesawexosavogomovi.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/48531527836.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109051645003785.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/28451184370.pdfIn PDF document text
    • https://siroyensao.com/upload/files/foxepunofoxefavapogin.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/84346295227.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/mizome.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/35130893110.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/fazulexes.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/94554861292.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/100577899.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/87760184486.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/74907434149.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210913103627_p4xeg6.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc9893b6b1---noxuvigevuwi.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/nisipoga.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/6471810444.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/19879400147.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wupanogejexigutinipisew.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/09/9586445317.pdfIn PDF document text
    • http://synphabase.ch/upload/file/tewubibajurox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=archero+mod+iosPDF 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_off0000c131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 17316 bytes
SHA-256: b9f1679edb2ea5fb4f2f259dc5a98bd8c7698c7a3d8575500588c7abd2d878f3
font_01_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 10208 bytes
SHA-256: 0b1573ef3c0f72036ed73c9f9bba18be611fc53f622de87bfc231d1e0755fc7f
font_02_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1