Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8b2da2f1b3f1a4…

MALICIOUS

PDF

72.0 KB Created: 2021-09-22 17:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9b04996754e798e448fc4be4bc41e9f SHA-1: 8175d970cb460e53fb6a5701caa6a1e9a7dbf2ca SHA-256: 9e8b2da2f1b3f1a4ef426e094f124e02793f41327b9de4263e7c32f73a220a8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=friday+night+lights+script
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/37928071751.pdf
    • https://tebra.si/userfiles/file/55106422070.pdf
    • http://gotoippc.com/ckfinder/userfiles/files/34112513257.pdf
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/96539497090.pdf
    • http://aitrans.cn/UploadFile/file/F1202109030845139024.pdf
    • http://joy05.com/_UploadFile/Images/file/56326634617.pdf
    • https://teater77.nl/userfiles/file/wurisuwuzulobabexifinegim.pdf
    • https://itscebu.com/upload/file/20210905070432.pdf
    • https://gizaviation.com/uploads/files/milofilosaxosagupize.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161344093d595c---49442169532.pdf
    • http://gospelpour100voix.com/fichiers/newsletter/file/wosozodekamiref.pdf
    • https://afritransport.com/app/webroot/files/file/wirekalivuvunawokeloz.pdf
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/koludixigopexenavatodudus.pdf
    • https://nikosdimos.gr/userfiles/file/59920212880.pdf
    • http://pointerboards.com/uploads/admin/files/45776077927.pdf
    • http://aprt1day.ru/file/38434705015.pdf
    • http://sfipl.in/userfiles/file/pibubixunajiwabogipugibik.pdf
    • http://csigikes.hu/admin/fck_upload/file/wagip.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ecf3f08d0451f2926674534c673e0a2a/3593239291.pdf
    • http://ihdbd.org/upload/files/92101753682.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613856468d83e---62689007228.pdf
    • http://murzilka.biz/images/uploads/file/vudavo.pdf
    • http://finpacecuador.com/userfiles/file/fowipipujaxemoguw.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/zivunonajun.pdf
    • 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_off0000b794.bin
7a2fd88e892058404de854405719e7a8afa956ea92d838b463d2683335f8cf94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 16824 bytes
font_01_sfnt_off0000e2ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 16792 bytes
font_02_sfnt_off0000fac4.bin
2ce7b90444d3d8f4237d2dc1ac22250e462d41641993612d639c9aea4b060730		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 10632 bytes

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