Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae6c23130d1b206…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 07:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9588ad9139bff725daa9435cbc35d06d SHA-1: 449c92d41f2ac6bd9eb35c1dde7be579a5463d4d SHA-256: eae6c23130d1b2065bae627bef264f4895722a8e28bec6a0bea82231a8586eb6
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with heuristics specifically flagging it as a link farm hosted on disposable domains. The primary function appears to be redirecting users to external sites, likely for further malicious activity such as credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://cructi.ru/uplcv?utm_term=anime+city+live+wallpaper PDF link annotation
    • https://rrr71.ru/upload_picture/80590885826.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/83739792789.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/95665245600.pdfIn PDF document text
    • http://kbchina.de/upload/zobogotufelusapij.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/mogovusaxumutinafobulureb.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/fumezupegitivow.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/77437473212.pdfIn PDF document text
    • http://sma-dfgg.org/site/admin/file/87563967313.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908132023279118.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/45327850948.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/55505530320.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/gogulalilasadamir.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/xomukawolegovomamazuse.pdfIn PDF document text
    • http://imi.vc/upload/files/86501694784.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/zukizosip.pdfIn PDF document text
    • https://ismart99.net/upload/files/bajava.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/kadesasunarurililero.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/55315940920.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d483aad9189ede0a7ea63f48992d4c8a/68504828651.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/68767584228.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/vusagotuvijofosajod.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_off0000afae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAE 10496 bytes
SHA-256: 28f2dfdce7cbe507a554be9a8bfa4e2ec845f910d68509c240325195dbb39336
font_01_sfnt_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 16616 bytes
SHA-256: e911960086bd41cca2259f919c2d5e38854ea165193f6131b75ba4aec0c306b1
font_02_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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