Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b88163bceaffe4…

MALICIOUS

PDF

82.3 KB Created: 2021-07-07 21:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97214b1b7948bb946f4d3ee9119b3708 SHA-1: 4394a275dbbd5430f61a39e3b1c1f39a6be2c85d SHA-256: c4b88163bceaffe4c0aae6adc03ba98fb7d021da7250aed8dd02105e6e963515
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains embedded URLs, one of which is presented as a search result for cracking software. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content, likely leading to the execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gerd-pollak.de/userfiles/file/kusuvesejo.pdf
    • https://cmsschoolkg.org/userfiles/file/44923532732.pdf
    • http://baraanduliaptti.org/userfiles/file/70610856941.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/55d704d236eda44e7a46602196b79b13/xuratixewamedejig.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958acb242a4---wiraleminekef.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160deb8a80d722---jafuligimabodamerotiwip.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdb68422e---lodoxetub.pdf
    • http://ilturismoinitalia.it/userfiles/files/neziguvepakog.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/26cf3bc109cbae4f156edd69315af269/6029137344.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f114473c11---34722331438.pdf
    • http://pspectr.ru/userfiles/file/dexetimalirej.pdf
    • http://utuin.net/files/fckeditor/file/33152457393.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/90f5d92c4dc7f82d85654a4e36264d57/25313237904.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d9182d3ed3f---19659636848.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8742d307b---88671379633.pdf
    • http://phunggia.biz/userfiles/file/32312395621.pdf
    • http://opusincertum.it/userfiles/files/48234560040.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609068a5af460---29915677479.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/256c69966db7ff541819ae0ae8e6a040/9456079187.pdf
    • https://benqmusicworkshop.com/fupload/file/17315794834.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/335008510e88cecc659715aa79a16c8e/didokigezuwudu.pdf
    • https://livre-art.com/ckfinder/userfiles/files/jusebaginasemugasi.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/prfmnjrgd60k3qe4g2qu3v01v5/tixid.pdf
    • http://piazzademarini3ge.com/userfiles/files/244455334.pdf
    • https://uppersanduskyrotary.com/cms/files/File/pekobis.pdf
    • https://ecoretras.com/file/xetixisamawit.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=crack+product+key+for+microsoft+office+2016+professional+plus
    • 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_off0000dc10.bin
54f10a1017cf6b982bf59459277db852967b0829f71dd9b73f7f154adbb0298b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 11580 bytes
font_01_sfnt_off0000f7b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 16792 bytes
font_02_sfnt_off00010fc5.bin
b9b69536e4cbf4114f28ac96edc096418634f53b68aa329f9b2eb5495a360516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 16664 bytes

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