Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3093158ed8ea8bb…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 11:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3037aed327cb25d034be6127395d779e SHA-1: b7b8157f6d435ba615199cfdfa7fbf0031ed29c9 SHA-256: b3093158ed8ea8bbc81137920bc9be9046286a0cf2a70f55c84c28032015e8b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggesting it's designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=minecraft+alt+list+2021 PDF link annotation
    • https://hoya.hr/UserFiles/file/jumixawixubevi.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/pepegeguvul.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/lepusawijowuzo.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/96086922300.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/59618710199.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/95708296655.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/16155010427.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/noxujejasaz.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/kebudopudurebitujoja.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/xulemojepida.pdfIn PDF document text
    • https://ptogel2.com/contents/files/82334912325.pdfIn PDF document text
    • https://12shio3.com/contents/files/tovemunone.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///kajujapesajibik.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nasolotegobiwovapik.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///41073780984.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/54875876679.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/73066182642.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/54804984618.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/pibavakipimisefurat.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/91424072622.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/91954921341.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_off0000bbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB3 10496 bytes
SHA-256: e2a0a1551667fd77069f5fc322c3fd6dc19a2e4be7e27c65b3dc4289467c14c0
font_01_sfnt_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 17344 bytes
SHA-256: 110e7b73e266130930be1ba5b181fe06f90a9fe14755ef882889936510ee18ef
font_02_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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