Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b6c75101ad3390…

MALICIOUS

PDF

92.5 KB Created: 2021-09-20 11:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b649bcaf3a4dad43b69bf171d8d7b38a SHA-1: 580c3aececad33329e944b44785caf275b94b457 SHA-256: 94b6c75101ad3390069bd9652904df9d3e2cf22df8d35c18190fafe822593eec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=playboy+casino+download+android PDF link annotation
    • https://www.leasing.net.in/ckfinder/userfiles/files/disunitum.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/petufavagivudexederim.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gavufasozun.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/kifim.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/50960623129.pdfIn PDF document text
    • http://htwy.com/upload/file/manosata.pdfIn PDF document text
    • https://mauspro.net/upload/files/werowepojawili.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/firizaw.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/kivifolarero.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1478be5bd---65748561288.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/68521561109.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/99575639582.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/41151356832.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/38933272909.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/72159442781.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/kifotofipenapal.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/fekoxoxojenebugisaxizetu.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_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 18064 bytes
SHA-256: 764a5715e778c17e30cfa56b2767ce345aabb15d94b4a977699d14e9313a7ea5
font_01_sfnt_off000134df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DF 10472 bytes
SHA-256: 61d0d88d4a47ccfa1730c6c3edd5e5659a244b8d7b13938f28ab1eadd6aea2b0
font_02_sfnt_off00014ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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