Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e62151cc9a1f56…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 22:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a235397489798d25aaf084371321d10 SHA-1: f1a8add56ec195c6208a6a84ca6a0b933467d9a5 SHA-256: 10e62151cc9a1f56bb3d5df264e932c17f8173e4a790e778dc5b4fd107ecddf9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and external URIs, indicating a malicious intent to redirect users to potentially harmful content. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into believing they need a password to access content, likely a social engineering tactic to facilitate further malware delivery. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wastran.ru/uplcv?utm_term=android+tablet+lock+screen PDF link annotation
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/nawopevajonowe.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/87964558817.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/puvozegafixerizunizo.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/sudalatatemos.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/34786423675.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/42bc13f641dc45570dcd12f8588b175a/57408210144.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/luzol.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef936c1e0f---16880469870.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/3746503264.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/nefufezovu.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/49271279245.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/xetemenoviwijid.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/16089006189.pdfIn PDF document text
    • https://unaizahic.com/Files/files/21024624031.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/8925594243.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/falepujopolurez.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/31905073811.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82125551666.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/86405680112.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/buvele.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/julajejinusawavu.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/jituzaputivelaxozoso.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/58053953438.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161394f47e4969---zubamagufavofidaxuledi.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_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 10576 bytes
SHA-256: af2a051161c558698eb9404721a8ae66a020bee205d92e88238e895a579a6cff
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 16404 bytes
SHA-256: fbfca90e5a860fc6c8ba839499fc2d58b609e38c107fecda7b900e7563b1be21
font_02_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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