Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd44d18781efcac2…

MALICIOUS

PDF

78.4 KB Created: 2021-09-21 04:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d00a3ba3816b8054a068c3816e19cb16 SHA-1: 3e4f56487e3a2a1c10f8c75119e12f17492bea91 SHA-256: bd44d18781efcac2ac664e61f95de57eb2fed8e26a00530768a8aece5d598ea3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or redirection attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a lure to a phishing site or for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vncdata.net/app/webroot/uploads/files/42408198470.pdf
    • https://dursunguney.com/userfiles/files/29018047699.pdf
    • http://arci-mp.fr/admin/File/kavutonafibokosuduxalez.pdf
    • http://dungculamdep.com/fckeditor_userfiles/file/33892704316.pdf
    • https://apskarota.org/userfiles/file/19357021055.pdf
    • https://guineaservicesproviders.com/gsp/files/xiwavemukabo.pdf
    • http://jessie.vn/images/ckeditor/files/55727236258.pdf
    • http://shiinamotors.com/js/upload/files/46491977939.pdf
    • https://ambient-interier.cz/files/files/zozunufewuram.pdf
    • http://kammerchor-lindau.com/file/15016845272.pdf
    • https://mycocoa.org/images/upload/files/10090129885.pdf
    • http://rotarybrescello.it/userfiles/files/73285546763.pdf
    • http://njbeihang.com/uploadfile/file///2021090410514837.pdf
    • http://mega-treid.com/userfiles/files/82131271799.pdf
    • http://www.vegagastro.pl/upload/file/dipirabateboluva.pdf
    • http://bocghedanang.com/media/ftp/file/lumodaxonugodarerasowin.pdf
    • http://1night2daytour.com/ckupload/files/numoloxuxitaxosi.pdf
    • http://sweed-trans.eu/ckfinder/userfiles/files/6340091042.pdf
    • http://utcsp.rustyramone.com/uploads/files/sofibuxabaposo.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613428751b053---vepafabupufa.pdf
    • http://fjzy18.com/image/uload/files/vufalifagatos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=battle+of+warship+naval+blitz+mod+apk
    • 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_off0000c33a.bin
ffba527efcccc2214938c0c6cf64c36914601e856c2d453c1ef2a6ad4d1215e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC33A 11260 bytes
font_01_sfnt_off0000dd55.bin
626ab4e4a5e1d8b0f686f359b7e7471a89dde3821395bec9acfab2e8ce05dbc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 21360 bytes
font_02_sfnt_off00011464.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 16792 bytes

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