Malicious PDF — malware analysis report

Static analysis result for SHA-256 952748b14b2a6b02…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 18:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb145d4462c4f7a1938f164c93b94b78 SHA-1: 30c087a3934ee0505182d1e22cd4a8c8b4d3ebe7 SHA-256: 952748b14b2a6b025b43f0235b19800bb99bd9eb94f5f7771db4d34fd217f63c
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the sheer volume of outbound links suggests a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=standard+deviation+percentage+graph PDF link annotation
    • http://fjzy18.com/image/uload/files/xusipuluwaxorivisas.pdfIn PDF document text
    • http://profstil.az/userfiles/file/43689882554.pdfIn PDF document text
    • http://okun.su/upload/file/30400557131.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135851357b12---91801638922.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/kakugosusa.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/73169171582.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e3de1ceaf0bf032b7c54aa612d77c21/juxezarodamapufaduwik.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/24345684869.pdfIn PDF document text
    • http://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/49708966995.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/43643937773.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/69558211914.pdfIn PDF document text
    • http://104408017.linker.tw/files/46982652573.pdfIn PDF document text
    • http://laserinnsbruck.com/static/75214489527.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/50489100697.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/bobivujoxodimugagogu.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/95416772865.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/voziji.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/vovokavomigujewuzeji.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/47820921743.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/xululeramoxofigezad.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/vukebujexibezalezelisoka.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/37878061652.pdfIn PDF document text
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/91860385417.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/57775945429.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/13095818392.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_off0000b3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AB 15604 bytes
SHA-256: 80db3e46c7e09e7f41fb82fcc207e723540e77d018036f59721f1721077f4db6
font_01_sfnt_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 10720 bytes
SHA-256: 648810737056e968397660eb8a23d9b77a1588706c05b2692d77d7d90f33c4dd

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