Malicious PDF — malware analysis report

Static analysis result for SHA-256 b495cfbc25d67502…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 02:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 166191cc9525d20d0a282b8e70609fed SHA-1: 29efb55a0a7133605fdee3bc002de9a9ee836f23 SHA-256: b495cfbc25d675029cf08438cc8e05647c0206fef0ab24440b3bb1910037bc31
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and the presence of JavaScript point towards an attack pattern involving client-side execution to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=spiral+2021+movie+online+free PDF link annotation
    • https://www.campacinter.com/image/upload/File/lovumigogij.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/komox.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c63b72db18834733a15d88146d3d388f/rugepukaramizesarebolamum.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/kuguz.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/92539302337.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/pavipagigawomopiwese.pdfIn PDF document text
    • https://ms01bet.com/contents/files/xenetujixuxi.pdfIn PDF document text
    • https://jobtiara.com/files/files/15627289451.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-7/20210907073154492631.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/zepifosifukemoz.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/51873452047.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/56012823039.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090613263338.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/pesudemonunagikij.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/51456264629.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/44703821489.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af71923a6f---7530565844.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/89889317063.pdfIn PDF document text
    • https://opremazabebe.me/userfiles/file/boxizudoxowoxibimid.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/bulawegudapolexolevolu.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/sidigizi.pdfIn PDF document text
    • https://iohrp.org/f_files/files/damibodevuxofobuba.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/80848436005.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_off0000b150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB150 10688 bytes
SHA-256: ddf066266b2ee5028dad7f584eeb68120abe034c4218223b98e4336402dbc57b
font_01_sfnt_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 17116 bytes
SHA-256: 5876aca9d0333dc2e1b5bd8b03e3d23148bb4cbf2673856241d14b378b1a0f12
font_02_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1