Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8aa4743bae4681d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-22 12:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: addb2a19bf03f953918e0194abd7d01e SHA-1: defc22e198b96524dbfd2baa6ff18cf56db8c2f4 SHA-256: f8aa4743bae4681d47e29af95f4be0fc46a6e8ed05f87fd5711a15e4723fb414
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are structured as link farms pointing to other PDF files, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=download+gangstar+vegas+latest+version
    • http://paulabenveniste.com/UserFiles/file/zopaz.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459425bf245---28979185437.pdf
    • http://mobilni-kadernictvi.cz/files/file/4590278813.pdf
    • https://mondoaudio.it/img/uploaded/file/33453656956.pdf
    • http://agcslohian.com/userfiles/file/63095382818.pdf
    • https://inprovitchile.com/ckfinder/userfiles/files/jojijorawiduzubidavutakim.pdf
    • http://powerfalcon.net/uppic/files/19599032860.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/87039053184.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/vagodutifuzowofemi.pdf
    • http://alisawedding.com/upload/users/files/pakamejenegutegoloxam.pdf
    • http://vervesimuhub.com/userfiles/file/liwixosabotef.pdf
    • http://canvangdientu.com/images/file/disudiponewilimede.pdf
    • https://arrayamed.com/userfiles/file/16561021895.pdf
    • http://ng-sons.com/userfiles/file/62476402782.pdf
    • http://chuabenhxuongkhop24h.com/images/files/24076964407.pdf
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/15823288302.pdf
    • http://captainkillmite.com/uploads/files/202109161626075965.pdf
    • http://domario.ru/userfiles/file/wujimuvekodevonuwore.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0911/23ee7acc5831410778efb1d7a8815fdf.pdf
    • http://jayeonrak.com/upfile_editor/2021/files/labem.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/376ea5f965776ee4bbe36f595327a01c/67239381680.pdf
    • http://usarsenal.it/userfiles/files/likozutemuximo.pdf
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/85869238300.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_off0000b650.bin
4153707a5bcbf8a5635c13c7cd0483baf37c0f7e4f041d79ab095cbb25fefc27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 14804 bytes
font_01_sfnt_off0000db89.bin
62659311c6014097b0440b3b7259f7ce357ced06d939815cd7c7f405c3283b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 10576 bytes
font_02_sfnt_off0000f3aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 16792 bytes

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