Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddb3971831dee35…

MALICIOUS

PDF

92.0 KB Created: 2021-09-20 08:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5ffe7442aeda4f90fc0a60e52099d30 SHA-1: 1aef31b6b247534fac20c4e001014aec33819b82 SHA-256: cddb3971831dee357611f2b254e6254491ecde4deaf9f3e4e4083702d57a5ba8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as an attachment, aligning with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://krisoc.ru/uplcv?utm_term=install+android+on+raspberry+pi+3 PDF link annotation
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb273410c7---falekibajuzuriwinageket.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/35613987965.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/kevuwozupavokogenoxo.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/78705063967.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/54981788194.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/50877549812.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/tesiwivowinevosuxoku.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/62899563540.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/sitakuzarotufor.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/fekexuberavudupi.pdfIn PDF document text
    • http://cpviettin.com/upload/files/fapizubezomiwelok.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/pobojopujavinem.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/34884500781.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/kutesozubekajew.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/sezapikosukobuwomatakusi.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/54294262726.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/berenumifilabizuwofanura.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/tuzunakexolezaritizo.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/vorasos.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/36509457052.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/26910010914.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/11730974485.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/19432752021.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144ad8d18ced---22787045874.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/jonanafojesifafadajitito.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/bikalazuto.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/dowitepepami.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 19016 bytes
SHA-256: 67993528f358f44737035cbc6cb4ca31ba59815787d82777bd879578a17f213a
font_01_sfnt_off00013109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 10760 bytes
SHA-256: 97db1e86bc2bedc6f97a1d1680600d8934d423dd77bcd37665d5e61aaa2880bb
font_02_sfnt_off000149b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1