Malicious PDF — malware analysis report

Static analysis result for SHA-256 083b2b9c451673b2…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 14:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d00b3f01d7efad198fc8eb74c146f64 SHA-1: 2b2152658cec78c6abc462360dc997ea46581004 SHA-256: 083b2b9c451673b2d8fe3d937f331cbf29f9679d07fd223d6a251f2c0bc435d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://sakesushilakehavasu.com/uploads/files/77286484923.pdf In PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/21986660482.pdfIn PDF document text
    • http://bulmarconsult.com/files/jusosorejagatavar.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/pitepimusovudejotusufu.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/fiwiposugu.pdfIn PDF document text
    • http://belean.pl/userfiles/file/94069373126.pdfIn PDF document text
    • https://guijek.com/userfiles/file/54827325297.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/43540900206.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/futovinefuvawelinikinur.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/62228730657.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/vasibiwizutewe.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ece66d3e9---19686205383.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/kumimolebadiko.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/92468836405.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/ridilepipedusatozixaxu.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/23289572987.pdfIn PDF document text
    • http://chinazzjx.com/d/files/linarixubaxitogafo.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/ketiminugovizedemuzadexo.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/25462736540.pdfIn PDF document text
    • http://strap.sk/uploads/file/39431883945.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/zimimowoxivogodemopabeve.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08e43349f---29535855615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=which+is+the+best+bike+racing+game+for+androidPDF 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_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 17012 bytes
SHA-256: 0bb272d05e1ea2f4fc156361fd79e22e9b5ff72f4c1df51f3056ed6dae179a69
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 11100 bytes
SHA-256: 04643a1631fd13f82cb9626445c23381f4643c14f2ca813eb50cf50d7c7a62f1
font_02_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1