Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac3465ce2548ea2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 18:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a92376ec9fd9e74db59402feda77b8ab SHA-1: e6c2514ba43779cb118d0cb90999c9e236a98cf0 SHA-256: 5ac3465ce2548ea2af413f5fcf405b1239a78bf10ec7d8a7547811edf6dc456a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains a large number of external URIs pointing to numerous distinct, potentially disposable domains, characteristic of a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://vivaibonomo.it/userfiles/files/90946031516.pdf In PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/zadofegelixu.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/95049807827.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/67062218541.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/46702139436.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210908_5FCF70A807B344FF.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/46764587393.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/zavigeduzidexejalarelug.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/18779724724.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/16680088989.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/raxonitaxologulegalu.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81341376131.pdfIn PDF document text
    • http://iucecb.com/files/file/bowuzixox.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/sirekuloxerowaburu.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/tutigutus.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/50779003485.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/83697176070.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/biromatifajawelirif.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/85398012136.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/2787806041.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dce259b5795ca17f94820ab349cbb355/83979646764.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/pefofetavivele.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/rawatuvipasifex.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/xotozoxix.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/92860037026.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319139d881d---35850343389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+transfer+contacts+from+old+phone+to+new+phone+androidPDF 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_off0000d89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 10960 bytes
SHA-256: caad553c0a3b20fc3cef6fa20751afb86c4d745ec3f878a061d53c9c1ef48105
font_01_sfnt_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 17300 bytes
SHA-256: 50612349fc37953d0f54dbe07a2c8e9618d1946b3622ff2865c5bca08e19353d