Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ab25037335d82d…

MALICIOUS

PDF

76.6 KB Created: 2021-09-20 03:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14ef4b640b2a258cd3fe86b0d7d01eca SHA-1: 513a8a996fabd94109928fa57214262986a5f7ad SHA-256: 20ab25037335d82dbf232bd3be4069eede24c698f67c978309fb29b756f0dd64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://innotack.com/userfiles/files/27794731275.pdf In PDF document text
    • https://projetounificado.com/uploads/files/rixuxewagenufunumiwewalog.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/87196105313.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/24808679904.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/begixa.pdfIn PDF document text
    • http://noithathoaphat11.com/upload/files/bubizelemusij.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/bugavanulino.pdfIn PDF document text
    • https://masukpt2.com/contents/files/14027505285.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/gajewofudaw.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/5298890062.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/69761768887.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161426ad26b43e---gufiwekenuribojigel.pdfIn PDF document text
    • http://simoncaulkin.com/images/54125002722.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/41128163627.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/2876957011.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bitegerasokoduk.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/babusimokadiluwukara.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/14784844651.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/memofibez.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/tikavidufulor.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/sobimakefolibenap.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/88471997246.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/xulazowoledubeten.pdfIn PDF document text
    • https://shidoremicrosys.com/media/1104380037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lost+in+space+watch+onlinePDF 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_off0000c737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 17720 bytes
SHA-256: 4bc9c98e2b5d4dc926437571404b99b6894adefa0c65ab299118ec6a367aa750
font_02_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 10412 bytes
SHA-256: e8d75052cafb297def9aa4eabaec446067a138b7e737c113d720dbc788d0d8bc