Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9da25b30d14cab0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-08 20:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61f53065ea57295a13c5aeb88de1294f SHA-1: fb0d403622bb04f64dffefdd04047e4ef69accc5 SHA-256: c9da25b30d14cab005799d81cad58fe4209fc04c7cb8fd0aeb5408ba9102188f
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect users to malicious sites, likely leveraging T1059.007 if JavaScript was present but not carved.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=types+of+natural+polymers+pdf PDF link annotation
    • http://designklasse.de/ckfinder/userfiles/files/98149963956.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/31592614089.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/lagix.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/71273500822.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/51398190531.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wokikuzofodimusebawino.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/93710599822.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/99171373115.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/nujapudiwerenobekexefez.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bf39d7767---kufugimonepibupasup.pdfIn PDF document text
    • https://birudongker.com/contents/files/68388626876.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/64294953108.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/tanuxazi.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/90690906239.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5e810382dd071e96a84fa900d65fbf4e/54269047751.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/xevutab.pdfIn PDF document text
    • http://gzwep.com/img/file/202198141320.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/muzifibu.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/tinesomigevewewosezuv.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/finitasova.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/67372794364.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_off0000b424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 16588 bytes
SHA-256: 80939118e3dff39e3d110c3931daaa89b5649854faaa874589c3d1d90245243f
font_02_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 10744 bytes
SHA-256: 2a6abc0fd8c874e6854776e53445745773fc3e5c163fc6255da814627d118f10

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