Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2ee406563347c0…

MALICIOUS

PDF

81.9 KB Created: 2021-10-06 20:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a0688b838462873e0436088a6eefb5b9 SHA-1: c2160da8b7cbf63235b1d9439d82e32f441b9e10 SHA-256: ea2ee406563347c0991f9ea44d4a0fe765532b285b22f138d524647708d2b67d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dafangtour.com/fckeditor/userimages/file/98667206559.pdf In PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/tufinuserawonuvomiza.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/mexinalemuna.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16308750021231085986.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/lapedepujerazozalo.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/46792044644.pdfIn PDF document text
    • http://mopron.ru/upload/files/xibotumur.pdfIn PDF document text
    • http://autokaryszczecin.pl/userfiles/file/78979256639.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/44490925119.pdfIn PDF document text
    • https://maria-galland.ru/files/file/35977553471.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/busuretasudameteguxeb.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109160101322222.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/nozafowamenezunadurasa.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/72871106443.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210912_7805704A6CD64A7B.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/rijuxolidapomuze.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/98195197653.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/43183738325.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/85469854782.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/xosonem.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/bagironesojibixogudalu.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/xubumakokenuso.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136914eb10c2---66789551513.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/62477829053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=avogadro%27s+gas+law+equationPDF 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_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 19156 bytes
SHA-256: 4808bf126f7e2538508352cda978bfdfaddcc45ce52a787a223883c2a5c429eb
font_01_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 10836 bytes
SHA-256: 91d4775b620416e2bcfe6fcd095f5983bd28238ab75a2340b0b1a7ab17fce4b6
font_02_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1