Malicious PDF — malware analysis report

Static analysis result for SHA-256 81590bfeb96e12d4…

MALICIOUS

PDF

62.3 KB Created: 2021-09-14 06:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f251ddabe5dc8ced87c899a0ed8b7ba2 SHA-1: 8aac98bd3ddffcaaea01538b7fc2d53433450e61 SHA-256: 81590bfeb96e12d4fb2f804151ce70e008b5f9ee13c1aa3856b17c72af22abaf
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also acts as a link farm, pointing to numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://sino-web.net/filespath/files/20210912150733.pdf In PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/gamimizajevodezowolid.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/49678972616.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/kaxodukejoba.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0b7ca603a21de09daa5996d7b1f05a58/paguwike.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/tezatikalowe.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/28474825801.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/fopuzimezodafixi.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/gomit.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/39124319988.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/51081704644.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/28457642612.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/refilagij.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/12887825760.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109050257424487.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210910_C4091BD17B5AAD0C.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/19094706780.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/70327300131.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/89327775165.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/mokojutomowibelenetejoz.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/89649594489.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/32727387613.pdfIn PDF document text
    • http://machulski.com/public/file/dowaserimerer.pdfIn PDF document text
    • https://togeltop.net/contents/files/lefefelurife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=google+play+install+stuckPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 10792 bytes
SHA-256: 80b3de5de3c55f4c205c9560865a3a92b68df9916e6d8d9f798bed5efdd4ac92

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