Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68523517b2494bd…

MALICIOUS

PDF

87.1 KB Created: 2021-09-22 21:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b922256668fdfd0c4c7b27d691446b90 SHA-1: a04c2ee31227fe742b418785732b43a3db092c0a SHA-256: c68523517b2494bd36bdbd9dbbb8f8a0f7e853fca63b7bf7487494d2f7c4c58a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the link farm structure suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://samsunyapi.com/userfiles/files/wipamunetegakaferulaseluf.pdf
    • http://bebelino.ru/userfiles/file/tedoridapiboko.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/51760025842.pdf
    • http://mh-gartengestaltung.de/userfiles/file/52726980175.pdf
    • http://phaptangpgvn.net/app/webroot/upload/files/87552225210.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/xoraleweliwezerajewodul.pdf
    • http://laguna.piyawatgroup.com/images/files/defazu.pdf
    • https://alarrabnews.com/images/content/content/file/midokop.pdf
    • http://musikpark-live.de/userfiles/file/71706106295.pdf
    • http://thietbiotoviet.com/Images_upload/files/91104294899.pdf
    • http://reckdance.pl/userfiles/file/domufefuzot.pdf
    • http://bloemenwinkelindex.nl/images/uploads/tukejirezepukekox.pdf
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/gigebuworiwapoxubemizesal.pdf
    • http://www.cpiequipos.com/assets/images/user_files/files/50337057581.pdf
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/5271999588.pdf
    • http://files.ibiza-ferien.de/file/fitilodetiletutoparenev.pdf
    • http://pension-erlkoenig.de/img/editor/file/99293693617.pdf
    • http://www.urbanwaterways.info/files/rofonujikasonepolijuz.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/zufolitivajegejog.pdf
    • https://network-italia.com/file/64565860639.pdf
    • https://pezenasenchantee.fr/userfiles/file/gaxepumupeburajapakodi.pdf
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/69757185592.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fieldrunners+2+hack+android
    • 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_off0000e60d.bin
2a036fbc16be7bb07dd566873216d3a895b331efd589e9ffeb747e2bd36464e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 21880 bytes
font_01_sfnt_off00011e4e.bin
5e983a093a5ff39e728cc022522fcf1db23a6160babdb1dc48015609e97b5032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 10656 bytes
font_02_sfnt_off000136a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136A7 16792 bytes

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