Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ec2cf7b5af4ee4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 09:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: caeebb8fff9f8a1e63b1a0a16675e61d SHA-1: 9b0057377bbb24285e699f6453ca679cac4e42e1 SHA-256: f4ec2cf7b5af4ee4af09e6a5c9be291e1778876033838085a8fd78178626a759
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://electrogalicia.com/electrogalicia/recursos/archivos/20103809007.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d481e101---43109226077.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/fadefuj.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-2/20210902231209962786.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/90850944321.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/62128758944.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/32466215743.pdfIn PDF document text
    • https://linker.tw/files/50957995520.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/53352810123.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/26050298852.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/25804815415.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/47608181039.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/90012760664.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/72796045451.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fa5fef24feb0ed687793720df18e06d8/nivatosesewat.pdfIn PDF document text
    • http://workontext.ru/media/file/tojipasopaxasik.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/bulaperawebuwut.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109031000039987.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/xegekubajuramer.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/1472317011.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77223660631.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/bigamokokuronijow.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/ledogolikomuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=games+that+work+offlinePDF link annotation
    • 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_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 17672 bytes
SHA-256: 02d4e34fb5d5b7e4220ff84ca5aa9d09f2cd49d8daaf2680ab166b21bc8561cd
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 10696 bytes
SHA-256: 1d444ea67b6f92cd1e5776b07338b3beca52b02185b5b85d53a851aca08a6ff0
font_02_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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