Malicious PDF — malware analysis report

Static analysis result for SHA-256 a462cdf787751c31…

MALICIOUS

PDF

70.8 KB Created: 2021-09-30 10:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ad209992f7e79f3a083903a7247a5c5 SHA-1: db901966582fb9bcda4cf5b3f82b240f3c300c98 SHA-256: a462cdf787751c311a6df8b512061df3bd206d9627c6a82f8089802b33242434
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous external links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dotcomtravelegypt.com/userfiles/files/65068764586.pdf In PDF document text
    • http://dorrstrechy.cz/UserFiles/File/96836272416.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/nesalomitoreni.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/48275485278.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/35322755357.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/22394554228.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/notidezakenolefubisesum.pdfIn PDF document text
    • http://proxima-design.cz/files/file/ruxogexefujotemolavujela.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/fofujit.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/tuzepajanos.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/6358795441.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/jolod.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/49061238370.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/37847942188.pdfIn PDF document text
    • http://guitarenko.fr/img/files/wuwunamubalomid.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/modinomalaw.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/nanas.pdfIn PDF document text
    • https://pokereshop.cz/data/file/manasonubevuvarikefaje.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/kavitupu.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/55392357768.pdfIn PDF document text
    • https://marblobath.marblobaths.ph/app/webroot/img/files/damixuwinejojidulo.pdfIn PDF document text
    • https://www.confirmedtour.com/files/texejuregazukopagos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tamil+dubbed+telugu+movies+online+free+to+watch+high+qualityPDF 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_off0000ad85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD85 16572 bytes
SHA-256: 3d8ea8530428cf408207257b2883991c65f5224bd666fb773b8a4a9bf6c30921
font_01_sfnt_off0000d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 11540 bytes
SHA-256: 04501a75a8ff93e0f57e08c7b9f556f58329e9286fa25d3b45c6474bf3e693f1

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