Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b61455af7a7a24a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 22:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2079f89ef554a61cace7400cc3dcac1 SHA-1: c23559d852fa99917ddfada13cc6cf5ed232bd54 SHA-256: 3b61455af7a7a24a1eab2caec79251b408fe7289476852ea2c9b1845e46a52a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, likely for phishing or malware delivery. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://cw-cut.com/uploads/file/91397188093.pdf
    • http://caffepontoni.com/uploads/file/madaraz.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/sifoxirukisonikebofole.pdf
    • https://hotelharmika.com/assets/userfiles/files/datukozinusasawu.pdf
    • http://amandatour.ru/js/ckfinder/userfiles/files/ralabujulazewiwotaxev.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/xikis.pdf
    • https://fuoriscena.eu/file/tugenuvidexazofibug.pdf
    • http://ryukatsu.com/userData/board/file/14337595224.pdf
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/34512680934.pdf
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/49175266219.pdf
    • http://soluzionebenessere.eu/userfiles/files/57501754319.pdf
    • http://insuralead.com/userfiles/file/88771672640.pdf
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/jakagivufogusugobupinaziw.pdf
    • http://pointerboards.com/uploads/admin/files/kosejulebekojatox.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d5adcbe5a---derolejolexebu.pdf
    • http://spielundlicht.de/content_provider/documents/files/24100245092.pdf
    • http://thegioichuyendong.info/app/webroot/upload/files/18637532110.pdf
    • https://htchninc.com/d/files/57592619154.pdf
    • https://tvsporedi.si/vsebina/zutowoduni.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/jemizoji.pdf
    • https://nhabe.com.vn/ckfinder/userfiles/files/18188614922.pdf
    • http://bassonconsulting.mc/userfiles/file/83143704673.pdf
    • https://ysh.my/userfiles/file/74510107320.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hide+folder+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_off0000e2c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 16792 bytes
font_01_sfnt_off0000fad9.bin
a1624ae72b0a79c1919eceb89fd180c9a395d72a49fb7b53fa5899f5a25da99e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 18316 bytes
font_02_sfnt_off00012a0d.bin
4da1d6518d2afc9cefd402a00d235314091df1f3d1e29c29e0690f54e4f4a120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 10072 bytes

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