Malicious PDF — malware analysis report

Static analysis result for SHA-256 923f1592e5ee86ee…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 14:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2b8080696c12205e48f64025857fdb6c SHA-1: 54f50a578fedd1b4630edb03807aa41378c8cc2c SHA-256: 923f1592e5ee86ee3a6798192633648e78336a412df4ab716ed98fcdaad6a111
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting it functions as a link farm. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to direct users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://coffotea.com/uploads/files/202109011131414264.pdf In PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/fogujisupapajaxepudonuv.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/73466919526.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/morirov.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/22975303910.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/15696281860.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/tavugunajeriwigawo.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/44173579020.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/53340507546.pdfIn PDF document text
    • http://sial.pl/galeria/file/kopaso.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631465743.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/21193740388.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ac9b79ababe37c85be398c1b150f4faf/rekewiwanonafobivud.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/52702397984.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/jutesejegofavakexo.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/rebukikibulufosurulu.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/memivuwa.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/68630112949.pdfIn PDF document text
    • http://baove24h.org/upload/files/bekafu.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/27032118267.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/zenanedajadesimixali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fun+games+to+play+on+play+storePDF 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_off0000afaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAA 10696 bytes
SHA-256: b1f4d6f18fb3ef5b57052d3361742b761357cb0a80a4f81fd86499ed59692223
font_01_sfnt_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 15928 bytes
SHA-256: 6f7db1ded31deb7f4c6a19091efe2964c9d055072702741a6dda2efcdc254130
font_02_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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