Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3721ca31e0f9b20…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 16:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6d04d188f73f2c4c3d852fa2d701952 SHA-1: 957d0fc947da3011f7d342103b42a65332fc567d SHA-256: b3721ca31e0f9b2016c017e376f1adde1a9ad40ba9c74d582aa74401a26b6c87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm, pointing to suspicious URLs. Although no scripts were extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://unityproductions.com/upload/files/68802959033.pdf
    • https://ibshospitals.com/userfiles/file/83246100728.pdf
    • http://kassa.pl/userfiles/file/movexox.pdf
    • http://saluteebenesseresas.it/userfiles/files/guvifisevunorobofidibowa.pdf
    • http://ibshop.gr/uploads/_uploads/files/mowufusuruwurupezil.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946d998e22---46050481399.pdf
    • https://zoorichi.com/temp/fckeditor/file/vojawujagox.pdf
    • http://gld-lining.com/user_img/files/6391421251.pdf
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/zibonelap.pdf
    • http://aa-nusd.jp/kazijaziwomad.pdf
    • https://ph2020.org/FCKeditor/file/lutowuzizuvuvisuvazasa.pdf
    • http://www.monts.sk/upload_images/file/99327472886.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/22003069821.pdf
    • http://mama-care.com/UserFiles/file/86041715008.pdf
    • http://pincodehub.in/userfiles/file/falifulalanuzilal.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/tusedoxonofimi.pdf
    • http://wirtrauenuns.ch/images/file/gurinavopifej.pdf
    • https://martas.vodrsport.cz/uploads/files/10876423245.pdf
    • http://cyuanmei.com/userfiles/file/88655538123.pdf
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/kotoliwujidudabaxalefetuz.pdf
    • http://mbeautyconcept.com/upload/content_images/file/39308401677.pdf
    • http://duhochoangthanh.com/upload/files/tevifux.pdf
    • http://jingyilin.org/uploads/file/54225418999.pdf
    • http://residencelesaline.it/userfiles/files/vukirivudoxe.pdf
    • https://oriental-kitchens.com/userfiles/files/foxelogokagagavonavo.pdf
    • http://gibisch.info/files/files/jimemegidukabotelizovodet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dear+john+book+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_off0000cc6c.bin
b0aabc408ef0af27ba254a035eb144d33a4ca7a159df510e6f96fbf3b3f11151		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 17848 bytes
font_01_sfnt_off0000fad5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 16792 bytes
font_02_sfnt_off000112ec.bin
fc8fdd9bac494455f788d81b0ae6c4dd8d304d0043c88f7e55a38e0d970b06f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 10552 bytes

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