Malicious PDF — malware analysis report

Static analysis result for SHA-256 03196413729d0a93…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 08:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a82dbedb46a73f95fa517215219c3a3 SHA-1: c3cb6562f776ca428d00ab9ca3d87f58e4bc0e05 SHA-256: 03196413729d0a935ea28d6a97d3bf7dac3756060fb4530d211b184b223b8065
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further compromise. The presence of embedded JS suggests it may be used to exploit PDF vulnerabilities or facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=download+fast+and+furious+9+hd
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161328219bbaeb---fapufekubabepaxak.pdf
    • http://contelex.it/userfiles/files/sizadupod.pdf
    • https://minhvuongthuphap.com/upload/ck/files/73713612764.pdf
    • http://rileyillustration.com/images/agency/files/suzuforuz.pdf
    • http://webbuilders.com/files/file/xifabogizufusogop.pdf
    • http://bharatandcompany.in/ckfinder/userfiles/files/25521043610.pdf
    • https://basisnomor.com/contents/files/52864130059.pdf
    • http://balalajka.nu/media/vodunowa.pdf
    • http://godsownproperties.com/userfiles/file/80661816248.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee7a23d603---28315991121.pdf
    • https://insp.biz/img/file/6683357280.pdf
    • https://takipbizde.com/calisma2/files/uploads/77866728160.pdf
    • http://oralrem.kz/ckfinder/userfiles/files/44506510837.pdf
    • http://ajej.pretty-match.com/upload/files/92416049739.pdf
    • https://ww150006.linebot.net/upfile/files/20210924075754.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/4698595955.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132b843dcaab---zejazidov.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/zadesejeluxofugibojaxu.pdf
    • http://ghibms.com/userfiles/files/zenilumite.pdf
    • http://gurukripapublicschool.com/userfiles/file/ligapasij.pdf
    • http://pzhjintai.com/upload/files/nojil.pdf
    • https://u-spot.biz/js/ckfinder/userfiles/files/93529177302.pdf
    • http://tech-in.info/bramy/userfiles/file/74785867532.pdf
    • http://ngoinvest.com/uploads/ckfinder/files/jubaxitomeduwuda.pdf
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/29391935307.pdf
    • http://eperon-kochersberg.com/img_db/98537616945.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_off0000b4cf.bin
035a639e7b34c6ab0ae10fa549e1676f659ebb5f3bd03606faf411f826e4c202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CF 14848 bytes
font_01_sfnt_off0000da07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 16792 bytes
font_02_sfnt_off0000f21e.bin
a945d904a707fe5933ec930c3fc9f7e40d188dd42c877754124843f999fa9e57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 10672 bytes

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