Malicious PDF — malware analysis report

Static analysis result for SHA-256 5360e9e6381b576e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 09:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6b0494200451d50864cb3c9c2361a87 SHA-1: 1d602569f36223ce8c9da94b4c1cbe3053339417 SHA-256: 5360e9e6381b576e1dfba355a7bae6798fb03bbb0a8ebc124a16e98842d46a7f
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 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score further support its malicious nature. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=upcoming+valorant+skins+2021 PDF link annotation
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/93164616926.pdfIn PDF document text
    • http://goldia.cz/data/file/wetegevonimifamija.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/nixugepoforozop.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/tivupufumimikewonirubad.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/vuforojulawe.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xogasizikazix.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/59386420676.pdfIn PDF document text
    • https://geloracinta.com/contents/files/zamawejifalawefup.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/wupaluz.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/rupowebanowewuzuji.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/gotivinigamup.pdfIn PDF document text
    • https://triosms.com/userfiles/file/69505005128.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/54411033771.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210914_4254F6937A273D5A.pdfIn PDF document text
    • http://sushi-belovo.ru/files/33944711491.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zasates.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/labupezujoguridupezaj.pdfIn PDF document text
    • http://altinay-law.com/images/file/55494915942.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/ladevasanikivumezatetegur.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/28dvfjrthdr2o9rmpe2kfblt0q/39752089031.pdfIn PDF document text
    • https://frisch.ro/files/file/wupowujakesevawulo.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_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 18304 bytes
SHA-256: c7c169f83537ee1f8d3a3a1c8163237acc5ffcb854ff3c250918ea76fa23364e
font_01_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CE 11044 bytes
SHA-256: c1678f58336acc67356a6e67e7cef09de7274fbc136864938ce23ee886b0d902

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