Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef5c5943ff21860…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 07:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c306d6c3a37939581188caf76e0fa892 SHA-1: f655a818cad50ce4e53f0feba8b5e1689707325f SHA-256: 1ef5c5943ff2186076f04803643826ae16a272b20b8fc6a3d58cc51dfb18d854
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with several pointing to unknown or potentially malicious domains, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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 http://gazetavk.ru/img/file/30526010563.pdf In PDF document text
    • https://lesrimaudieres.com/images/uploads/file/26320490286.pdfIn PDF document text
    • https://dalba.net/other_files/File/22778483049.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/86612953609.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/69285321395.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/gixokusovunezesunurolapo.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109070805342085.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0a78eec206f7ebb8d8c9a7697b8eeba4/7254377650.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/sonolibugubixozogunezo.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/mefalarek.pdfIn PDF document text
    • http://deforma.it/userfiles/files/21309883732.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/japefosulivujeped.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/51925928950.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090710494139.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/9187570277.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/2dc71bbcaa7f47ecb51840fd78a44ba3.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/wajosusatokikugikewi.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/60110008470.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/69753659570.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/35359563678.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/sopitupuvofobubemavet.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/zifekafejewuloguzizujafif.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/41365452541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=el+diario+del+profesor+rafael+porlan+pdfPDF 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_off0000d19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 10376 bytes
SHA-256: f9dcb00f1a223fbfed1b86f02215f241afcf0aad82963f8a9d8976ec511e88b5
font_01_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 19500 bytes
SHA-256: 5cfd2d3fe4ba413b2ba8a278896ba71fe2f5fdb46c851f7c656bb0a9fde8b9ad
font_02_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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