Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ace195b7cee165…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 05:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a0dc8c0c8747c8a3604d4a5431c6784 SHA-1: 84e3d8e20d7e1e2dc662a9973a796ddacb3a346b SHA-256: 56ace195b7cee16580a7b59815d0dfc1229d7b3ee973e5591af547992d16723b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous external links suggest it's designed to lead users to potentially harmful websites, possibly for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9133

Heuristics 4

  • 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://wastran.ru/uplcv?utm_term=live+match+app+for+android
    • https://keongracun.org/contents/files/sapezikaz.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/gomijufepuvavu.pdf
    • https://riminabda.sk/userfiles/file/pugofozuresiwifo.pdf
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/59567636329.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-12-21-57-07-44.pdf
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/2922774435.pdf
    • https://visualmotion.nl/uploads/file/xodetiruxizuwovema.pdf
    • http://captainkillmite.com/uploads/files/202109101328078675.pdf
    • http://pol2-simf.ru/userfiles/file/xonotezebanun.pdf
    • https://cobaltinc.org/userfiles/file/39341179276.pdf
    • http://www.cddfct.com/up_files/file/59895463029.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab4694393---31889618619.pdf
    • http://dichvutot99.com/webroot/img/files/84701321398.pdf
    • http://travelcenterpuntos.com/campannas/file/72867419510.pdf
    • http://cbcom.eu/ressource/site-image/files/36247519299.pdf
    • http://vindindex.nl/images/uploads/bomanejaxonuferelodili.pdf
    • http://emekyesiltepe.net/images_upload/files/60621269023.pdf
    • http://alwaysshine.com/fileimage/file/fibomofi.pdf
    • http://foto-recepty.sk/images/fotky/5801835285.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba0cf31ae---81048543674.pdf
    • http://yhbinternational.com/userfiles/file/25806190199.pdf
    • http://hacsbathtarntaran.org/~/userfiles/file/mulofexinotolezas.pdf
    • http://rheinmotel.com/userfiles/file/84503787501.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/90365202325.pdf
    • http://cuadepthanglong.com/images/ckeditor/files/takevutiraxop.pdf
    • 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_off0000f4df.bin
faabdc295a9e72a2be55bc1018c8a098d9bd25be829e6a06502a39fef73e095e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 18316 bytes
font_01_sfnt_off00012320.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 16792 bytes
font_02_sfnt_off00013b37.bin
bdb14395a186711cde1e2294344265901f036d0d1ef4f9d02caed1e55da4629e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B37 10692 bytes

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