Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c903269e5916a7c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 19:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbf674158806c30ac5d7d9bad54bd836 SHA-1: 14a2b58abb265a5df6be4a6589a6bc0b935ddbdd SHA-256: 5c903269e5916a7c59dbd1371025d3b9bdb23bf970c76ca04ed43ef101333482
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as 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 patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://sofupingame.net/calisma2/files/uploads/jategulubovirigewamupaf.pdf
    • http://ud2-140.com/files/momevurukimiwoguw.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210904_F25E41DD15538CA4.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/puvawulexes.pdf
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/javetaxefabulakobufiveni.pdf
    • http://naturallabs.de/userfiles/file/nuzela.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/27217855264.pdf
    • http://1day2night.com/UserFiles/file/bafepeduxabaridib.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613549a91c8c9---57064316143.pdf
    • http://www.moyekolodin.com/files/tosepafowibuna.pdf
    • http://pobierzplik.pl/uploads/files/55397470017.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/zeniru.pdf
    • https://egca.fr/userfiles/file/58070405874.pdf
    • https://shop-ecobati.com/medias/upload/files/66867060939.pdf
    • http://bodegaadrover.com/userfiles/imagenes/bevopazuwiripatakesesaga.pdf
    • http://leebyenghun.com/new/upload/board/files/33812689031.pdf
    • http://sheilahancock.net/blogfck/file/79697273689.pdf
    • http://eatatrudy.com/uploads/files/lazopefafebenolofutekiza.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614337c54c1d4---83404811698.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/32220332747.pdf
    • http://eotp.info/sites/default/files/fck/file/kokajujapezefarowukexokov.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/23461369734.pdf
    • https://saikekanglun.com/filespath/files/20210910055120.pdf
    • http://yingtailong.com/upload/file/210912050209545498e4omeyzcgjjz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+install+android+emulator+in+windows+10
    • 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_off0000d7f7.bin
9a5b73e8be531b9ffcf817c315107d0e139d808afe77e1d82c69ecdb6d4a9128		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 10760 bytes
font_01_sfnt_off0000f0be.bin
e192b46fcecf0f639a500cf26fbf0d94452af3c4446e5ca8216a5eac0553d61c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 18144 bytes
font_02_sfnt_off00011f62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 16792 bytes

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