Malicious PDF — malware analysis report

Static analysis result for SHA-256 4138a13ec149127a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 09:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 790077bb9761c6009fef678eccfb9588 SHA-1: d942dd50e3a0643d834296edfc7f69f90743a500 SHA-256: 4138a13ec149127ab7e0fa2a0050dad754028bd108c701f69cca3d4cd39cf281
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=live+nettv+2021 PDF link annotation
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b158debae0b52c313b819e68caef0564/benozigosivakuxitox.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/17091775387.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091923265981.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/9226516041.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/99918380853.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/86377641903.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/puzapuvaposaxutajozilofa.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/40345488677.pdfIn PDF document text
    • https://phuquiland.com/upload/files/posade.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/zunenakivukokoxir.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/20783556660.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/tizobagafax.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/17686654814.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/luzimowewisaxegeje.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db781ee4dd---sisimivukenug.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jiwuvejodinuduzevixakagop.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/lapowe.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/58135793994.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109032214584448.pdfIn PDF document text
    • http://getdol.com/page_data/file/boresopolazel.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/48842342637.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/banegodiluzefidis.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/10564289544.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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 9820 bytes
SHA-256: 8876baacfc2cd41593e58c4c60dc86197e4664a8145fad35672e9c027f0797a9
font_01_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 17172 bytes
SHA-256: f3f597b20e4803e0e01c7d10ad8f764388155d5604555fce70ef57a74912d6d4
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1