Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e86f8c6f3947b03…

MALICIOUS

PDF

72.4 KB Created: 2021-10-06 00:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1c09ebba05bb68940388d8a23917b6d SHA-1: ed02460ec0f3bd88d24816494fc407b374e26ec7 SHA-256: 9e86f8c6f3947b03fee706bdb7e0d00d76456cf0a727b10a88654d9a5fa6d7b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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=how+to+make+blue PDF link annotation
    • http://poledance-chrudim.cz/files/file/lepovifetimifavidadenafi.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/44498410383.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/63426751474.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/97679225469.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/93250957225.pdfIn PDF document text
    • http://tianjin.relieved007.cn/upload/files/radetejidolatajabub.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/25052925232.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/16214255780.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/dowamarog.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/lenujabifu.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/gumamiwewalizarukesab.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/19937300985.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/lurag.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/99362404967.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1132920c0e62623b46b96a119b76995a/depulojekufiperiz.pdfIn PDF document text
    • http://rem-proekt.com/f/file/30556876948.pdfIn PDF document text
    • http://roberthalasz.eu/uploads/file/84454689995.pdfIn PDF document text
    • http://abnicum.ru/files/file/babidasunosotuwezu.pdfIn PDF document text
    • https://onecre.com/images/content/files/35022401100.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/20068183484.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/femosemurezefupulafuv.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/solizor.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/43090676850.pdfIn PDF document text
    • http://mebco.ru/images/file/81311533140.pdfIn PDF document text
    • https://suksesunited.com/contents/files/dasojixuratexeporibaj.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/35026059056.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_off0000bbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC0 10212 bytes
SHA-256: dd738a6bf866530d143f48df891624fe0569219e11f4498b41cf2e617dd4de04
font_01_sfnt_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 16012 bytes
SHA-256: 329f385da51ae5f84cc283b499a0822ea4adf4bc736fc8c873ff4f6566de113e
font_02_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1