Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a53f932ddd170c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 01:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ebf54e5301b4028f8c2dcc91d3dd409 SHA-1: e2da4de3e2088aa7e6e63fe75738f273a9b6b34c SHA-256: f9a53f932ddd170ced24a898cc5d27912789f798722c40e3f71fb1701f08a161
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, indicating a link farm or redirection strategy. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection suggest the PDF is intended to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://blagoustroystvo24.ru/ckfinder/userfiles/files/jerigifas.pdf
    • http://boki.hu/editor_up/62867257285.pdf
    • https://markapin.com/calisma2/files/uploads/36474902782.pdf
    • https://tl-systems.hu/files/files/27223789195.pdf
    • http://synhbio.com/upload/files/75660711322.pdf
    • http://vektorma.ru/uploads/assets/file/zanofesam.pdf
    • http://hanart21.com/files/userfiles/file/xajozemunalulixu.pdf
    • http://inarchengineering.it/userfiles/files/mozulewalifanorojegavafo.pdf
    • http://cancunday.com/travela/img/files/jadibo.pdf
    • https://branchennachweis.eu/userfiles/file/libexojixikipumelo.pdf
    • https://rajakeempat.com/contents/files/demozite.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/65098770235.pdf
    • http://wisdomtours.net/upload/file/36364320937.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/38272546592.pdf
    • https://eownauto.com/uploadpic/files/xewujogikexipolitinab.pdf
    • http://aeon-dev.com/uploads/files/202109011054284308.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135f657c6ab3---gupofadelumuse.pdf
    • https://optical-axis.com/uploads/files/202109201328569935.pdf
    • http://bocghedanang.com/media/ftp/file/sexujune.pdf
    • https://sharenkon.com/files/jimifigazefizovexifotu.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/jejelapojebovotinovitage.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8b208cb5ee0d728fe7fbfe4bf8796d9d/xepidinagamitafa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fast+and+furious+online+streaming
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb16.bin
39bab0c7da2328e93888055319707931b62951e4abb6ed032f8a06046d477a11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 10772 bytes
font_01_sfnt_off0001039b.bin
fd301cbbf229eca64a261e9c632a6f7217e436e0d73ea3322ed9d5cacd2a727f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 17404 bytes
font_02_sfnt_off0001309c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1309C 16792 bytes

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