Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85e1e42d72bb213…

MALICIOUS

PDF

81.2 KB Created: 2021-10-16 15:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 239b53a4b1426989d0c228caec2c587b SHA-1: fe56fc6536f6edcc750d17db3287a44cd90543b2 SHA-256: a85e1e42d72bb213a943305d7fca3daa7a2e081c7a425dab629eda80dcaef5fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=cooking+hot+dogs+in+crock+pot PDF link annotation
    • https://maconlux.lu/userfiles/files/99807838915.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/gaxelopefuteg.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/lipudisodulob.pdfIn PDF document text
    • https://edusfera.pl/upload/file/xugoxumet.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/73368660882.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/6931096366.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c14925216671dbe5c6db46503591af22/xedijosemerusiwapeje.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/torobafujajusek.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210909193724_148584142.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/75014155916.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/132307353077.pdfIn PDF document text
    • https://ikansambel.com/contents/files/tesojezixadokim.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/segojatijafibinuwop.pdfIn PDF document text
    • http://cssh.es/img/file/favisex.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/kufubuduwajanuwujigubexu.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/9743907322.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/37768970758.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/boduviduj.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/37856070040.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161319d2c9c1f7---90612360613.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/98665811404.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/dolejebuxikivasosuf.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/kigut.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/81337693992.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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 10576 bytes
SHA-256: 5a28463e19513af92606d3827d2ec607890b6b60ea9b25d9ed73ac43df115687
font_01_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 16668 bytes
SHA-256: a4eb60ace5707c09e0a879b7e284d63b90f5a8bebf10b782c01d76a12683f7ff