Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ea909c06c0f490…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 09:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c5720912535dff458d56ef93b728073 SHA-1: 9db420d1a3ef9f2f9cb6b33603f9de3da6f5b046 SHA-256: c9ea909c06c0f490687d6e0861f9252b015ee6880dc515ab996bbbe75e878fa0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, commonly seen in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cana.vn/uploads/userfiles/file/12370726941.pdf
    • https://ksi-system.pl/editorfiles/file/vusazorenenuvajovogo.pdf
    • https://carlojans.com/cms/file/gobavageperu.pdf
    • http://ipcmanpower.com/admin/style/images/userfiles/file/67773028815.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/rikiwobowexofupevawaj.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/41299074976.pdf
    • https://kolkataangikar.org/ckfinder/userfiles/files/49626025180.pdf
    • https://camping-du-lac-dijon.com/userfiles/fichiers/wawusedadorajumamib.pdf
    • http://gyogytornasz.hu/editor_up/29920801597.pdf
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/47452447979.pdf
    • http://resumesfromabove.com/userfiles/file/laxumukis.pdf
    • http://nemeckystrakac.sk/editor_uploads/files/konokoxilolekupana.pdf
    • http://ressourcengarten.de/azubi/userfiles/files/zuzerojegezomalatolexova.pdf
    • http://tbm-mova.by/images_from_html_editor/file/22911212611.pdf
    • http://luckysim.com/userfiles/file/betotuw.pdf
    • http://gddfboiler.com/uploads/files/xizezitu.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/bifevavivuvirojo.pdf
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/nuzasopebomugurenaliva.pdf
    • http://woodwaysindia.com/uploads/wireduti.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d8a9795e1---37168612576.pdf
    • https://auto826.com/uploads/files/58248759642.pdf
    • http://golfvillageonline.com/userfiles/file/46991266936.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jules+bible+quote
    • 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_off0000e70a.bin
efbd008330cd0d2e36db42561277e3bdf50af160470209f190a33dcc621b4e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 10112 bytes
font_01_sfnt_off0000fdbc.bin
0f9bcedeae08c559d80be7ab9a03a5a1c2bcf21f0801e6f29dee0a135f37cf5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 18836 bytes
font_02_sfnt_off00012e42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E42 16792 bytes

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