Malicious PDF — malware analysis report

Static analysis result for SHA-256 e031ca11a4f47151…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 10:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b6db3e591653b30ebf820d3dc52113a SHA-1: 79c1ff53645d88c95ab45382874dbf29cf534dc0 SHA-256: e031ca11a4f4715108395814e1f990730faed2f5a78c188344a52819abafa460
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ck-kutnahora.cz/gais/image/file/50024779622.pdf In PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/65305278092.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/sepuwizuletinize.pdfIn PDF document text
    • https://tepihtrava.rs/files/20203020342.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/bufirisivu.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/dosewevitufirizetemavuk.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/puvuzojofuledevulumej.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109100623473064.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/35018106585.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/powurexukelesutudu.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/rosixutaz.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/gogeruxede.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6240d476713b304c32fc5f42cd7e09cd/35346264234.pdfIn PDF document text
    • http://aa-nusd.jp/34220511948.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/sudugawolisifoku.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/pofenibibomobogom.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2fe79ebfa77e92863879ec17174922f1/jumedotonixujusigosoxexe.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/guzebetetiwozuwiro.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bujej.pdfIn PDF document text
    • https://ksuskalology.com/images/file/79803702953.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78336189150.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/20707693188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=send+pdf+to+kindle+convertPDF 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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 18028 bytes
SHA-256: ee67b8e0264bcc280247cb607b4beba5dd3084bdc07156898d09117036fe9f27
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 10516 bytes
SHA-256: 88d6cf08733bcaa421c5a84ec82d6a232adb068dcc28450455c5e2f3584e4a70
font_02_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.