Malicious PDF — malware analysis report

Static analysis result for SHA-256 f501e27683799c5e…

MALICIOUS

PDF

90.1 KB Created: 2021-09-21 05:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21657f632cab8e723889e256abe7911d SHA-1: e541705de8add5f910c788dc7fa2e7f5dec2e5d1 SHA-256: f501e27683799c5e3c01acea96c3fda14b0d3d7321fd43d3ae0958c8afb7e501
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://limsurempat.com/contents/files/28228441588.pdf In PDF document text
    • http://abbeloosschinkels.be/userfiles/file/61085485196.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/mefiva.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/kezekomunu.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/zovuvakosufebo.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/zojetalan.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/89586021080.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/funufezuwaroxum.pdfIn PDF document text
    • https://angem.fr/userfiles/file/tolonewawegotamefuvem.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/gajusozopunif.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/livum.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/28694469638.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/kubedavojali.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/5343733987.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa9b51665---wodomupisinogibuluwokuze.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614905039179b---wudojobalejezunotir.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/34059040560.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/42192843598.pdfIn PDF document text
    • http://mrybalko.ru/files/fevazamezogatosaxefajov.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/95655104779.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/12433563520.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/fetolajolejudamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=descargar+juegos+gameboy+para+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 19360 bytes
SHA-256: 7d65b720a214cab84678fe936352aed74d5742a2327a85174ee523f79a8ff342
font_01_sfnt_off000128ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E1 11196 bytes
SHA-256: 34268aba5af7a68e4eb5ccdd25f84b511f52b643c000b9c5c80ff163da28b3c3

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