Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acd02c7caa23430…

MALICIOUS

PDF

79.7 KB Created: 2021-09-28 11:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7429ed7d3455d364725c05ebe80bb71 SHA-1: 48934f71842c97492ec33dc5e0a271798b06dc47 SHA-256: 5acd02c7caa23430b8e4b235509c1b6f3607fc2e346fc76ce3e721b569c52485
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=descargar+naruto+mugen+para+android
    • http://adbuilder.at/ckfinder/userfiles/files/97573109777.pdf
    • http://195exim.com/datas/files/nodimufobolaso.pdf
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/19620689345.pdf
    • http://hwayoung.kr/upfile/files/76342181839.pdf
    • http://s4l.vn/storage/ckfinder/files/76475290760.pdf
    • http://kkslavicin.cz/sites/default/files/file/kijipekugete.pdf
    • http://raylutickenterprises.com/userfiles/files/kepug.pdf
    • http://trieuduong.com/images/Download/2825467234.pdf
    • https://mangalargalux.com.br/ckfinder/userfiles/files/kevukubekenokanupa.pdf
    • http://vivatbacchus.hu/files/file/32220090530.pdf
    • http://gzhangqin.com/uploadfile/files/22691943703.pdf
    • http://polyacer-ecp.com/userfiles/files/20210908_100806.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/tagikunagosa.pdf
    • http://omni-links-europe.com/images/blog/file/17825226605.pdf
    • http://restauraceeverest.cz/userfiles/file/76256490826.pdf
    • https://mamalight.net/business_school/uploads/file/55856664251.pdf
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/95617371067.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161435173e85f7---9840271424.pdf
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/51723234031.pdf
    • https://superpart.com/files/kazojujabijadov.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7fc969f94---wujigadipufexupuwezejeteb.pdf
    • https://sthouseluxury.com/upload/files/57657035027.pdf
    • http://ahjygjg.com/upload_fck/file/2021-9-16/20210916025432392620.pdf
    • http://designbyjoseph.com/uploads/File/15733386990.pdf
    • http://35ct1.com/images/ckImageFiles/files/kegekuziwerelopujunib.pdf
    • https://copacndg.com/images/uploads/files/88226655691.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_off0000c896.bin
ff7c5640e204c453da31ce6805a9a1a81e1052c1bf0743055318ca79a04534ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 21208 bytes
font_01_sfnt_off0000ffce.bin
cdbc2372aac55610d2f2fc4c40b42f22b8f913740c658af9469dda660698dd44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 10912 bytes
font_02_sfnt_off000118e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 16792 bytes

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