Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37efee03f3c82d0…

MALICIOUS

PDF

88.4 KB Created: 2021-09-17 12:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60d5f144ecdc6c9ec15370b5643296d7 SHA-1: 2596c34d1fd0ffa829ea69e4366261bf40d33251 SHA-256: b37efee03f3c82d0fe8ce1f12c32d06752cf76d67b32ed1b7fdc1f6e8a9047c3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://oniceh.ru/uplcv?utm_term=jungle+cruise+movie+watch+online
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/71689101412.pdf
    • https://msiutilities.net/documents/tadajatuwodes.pdf
    • http://shrlie.com/upload_fck/file/2021-9-1/20210901161905933686.pdf
    • https://sicurezzaips.it/uploads/file/jopukudojiberi.pdf
    • http://emachn.com/data/attachment/file/gujajot.pdf
    • http://pasaru.com/upload/files/zojijorefar.pdf
    • https://oxi-dental.ro/imagini_ws/31984261098.pdf
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18528672742.pdf
    • http://maynenkhiinverter.com/media/ftp/file/69770822545.pdf
    • http://citty.org/images/uploads/file/pukusezobedew.pdf
    • http://ruihuitax.com/files/file/xevanisi.pdf
    • https://davnosti.ru/upload/97469174198.pdf
    • http://abwplazaview.com/uploads/files/42164286709.pdf
    • http://cuspsurgeons.com/userfiles/file/bazoxesutokabaxidi.pdf
    • https://crbz.ru/userfiles/file/dogik.pdf
    • http://tycoonmedical.com/userfiles/file/vazitusibutesaxewazuma.pdf
    • https://shellserva.nl/docs/Image/file/galelemupogedo.pdf
    • http://sunmoon-glory.com/web/upload/files/luwidetetegatod.pdf
    • http://chapelguild.com/images/usr/zimixoberi.pdf
    • http://sb-78.ru/files/file/67615903855.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135daadb44fa---zomubo.pdf
    • http://kurumakaitori-one.com/js/upload/files/72846413516.pdf
    • https://coffeetuanvang.com/Images_upload/files/zuwuvaki.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/63353784099.pdf
    • http://hwayinn.com/image/files/20210909_040140.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_off0000f5eb.bin
b593f497801d29fbe71a7bcfb21ad60912f00c28f128d8b8d13f6d4b6085b03f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 10920 bytes
font_01_sfnt_off00010f19.bin
afc17e81845fb7bdc09b7e79bb4a400b0dc63d7737fe26f768dd75f6522a2b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 17520 bytes
font_02_sfnt_off00013c2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2D 16792 bytes

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