Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b21062dbb05b0c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 17:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 103075c06658c287974f7094705ee7d1 SHA-1: 432bbada1ec92fee7de376a875694ddd0433ae2d SHA-256: 44b21062dbb05b0cb05f4ca1d8985d0e0385f2a066ecff6e1931acdfbae127d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external sites that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://espritgt.com/userfiles/file/27554769058.pdf
    • https://tidymoney.com/ckfinder/userfiles/files/85801785463.pdf
    • http://sin-hua.org/userfiles/jonagesexidapekoza.pdf
    • http://teifsepahan.com/files/file/88259876930.pdf
    • https://szpital-sulecin.pl/images/fckfiles/file/wuguzo.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/21368942417.pdf
    • https://toananhmedical.com/uploads/files/danerugokurida.pdf
    • https://0a3exp.com/upfiles/editor/files/pipixawaw.pdf
    • http://fzsvybbs.at/userfiles/file/31984525697.pdf
    • http://testplanet.nl/uploads/files/bizemabadarubimu.pdf
    • http://spain-ex.com/images/blog/file/16538213954.pdf
    • http://top-caster.com/userfiles/file/gifofufet.pdf
    • https://cornerstonelaw.eu/userfiles/file/60892209784.pdf
    • http://divapharma.com/uploaded/file/naxulajufanojoxudom.pdf
    • https://ppkh.net/userfiles/file/39371745050.pdf
    • https://fallsplat.se/bildbank/file/rudosotuso.pdf
    • http://acpiindia.com/userfiles/file/difodi.pdf
    • http://stihoplet.by/upload/editor/files/59248827092.pdf
    • http://quimicahj.com/admin/userfiles/userfiles/file/riribidoda.pdf
    • http://dentish.ru/ckfinder/userfiles/files/xusakuwixokexej.pdf
    • http://zartmobilia.com/userfiles/file/20210917060859.pdf
    • http://purofirstli.com/userfiles/files/56392415205.pdf
    • https://rolcsi-bau.hu/userfiles/files/votejinaremuxunufax.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b686cc4ce8899f90a57bbe47ce42ac8e/zogafediduzefukoz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bach+invention+no+8+sheet+music
    • 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_off0000c827.bin
f6ec9f8914d5c5465ae4f7bc663ce27150aaf94b1e203c0bbab64846cfaa8593		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 10776 bytes
font_01_sfnt_off0000e0e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 16792 bytes
font_02_sfnt_off0000f8f4.bin
5634e2cfe353fcfc15d6f08d5a0b3271747047f6d682abbaab6e87842568f915		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 17844 bytes

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