Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6fefb9b21a47e0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 04:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb19ed16cab8dce8808550211eb90dee SHA-1: d8f88e1e3535370dd72a5a77643c7ae1f0dc910b SHA-256: 4c6fefb9b21a47e06a5aaca9baef66a61729250a7d20803858b68a9ea94a3538
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting. 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=how+to+flash+a+phone+using+pc
    • http://apicn.net/upload/files/jafizi.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/nituku.pdf
    • http://csaladiegyteruautok.hu/userfiles/files/68231029919.pdf
    • https://successalpha.team/upload/files/13107787524.pdf
    • https://heatingboiler.ca/fck_upload/file/63812499288.pdf
    • http://johnmarzillier.com/ckfinder/userfiles/files/54243706073.pdf
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/72636080044.pdf
    • http://sarljarry.fr/userfiles/file/44536419190.pdf
    • https://luckysurface.itweald.com/uploads/files/6134e850ac6ad.pdf
    • http://allineers.morefriendship.com/upload/files/foxivawidesubinala.pdf
    • http://zvaracskaskola.eu/editor_uploads/system/files/36140320974.pdf
    • http://unityproductions.com/upload/files/37020207645.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210903_6269326A4E416ADD.pdf
    • http://qiuyutv.com/userfiles/files/20210906041509.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8slehgrg9tj2ettc7knej99ufd/rovuvef.pdf
    • http://diegogenna.it/userfiles/files/ravoxupasuf.pdf
    • http://centromp.it/userfiles/files/jezuxutelisafak.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/75121464295.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/rubinal.pdf
    • http://vietcem.vn/public/default/ckeditor/files/60085085150.pdf
    • http://yugreat.com/filespath/files/20210905085427.pdf
    • https://kingwaterpure.com/ckfinder/userfiles/files/tedumun.pdf
    • http://9262895.ru/ckfinder/userfiles/files/52766501540.pdf
    • http://nirmalamathachurch.org/cms_uploads/image/file/bukubevosulevabiga.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_off0000d78e.bin
6cf2befd6b1b55ace269681e428a2805dd577f4eee1c1d6eb10040a525a04ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 10836 bytes
font_01_sfnt_off0000f08e.bin
cd2a835eb7c8e45ab193f0c92d3fd8353c3b2b32070d777f9edbcfdb112bd341		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 18304 bytes
font_02_sfnt_off00011f46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 16792 bytes

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