Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25da6190c6ad8ca…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 00:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5f44997108cb2774c97533bdccae79b1 SHA-1: f6d728595978c56a3da060b4255d8639fd2fde9d SHA-256: c25da6190c6ad8ca21ef2ba06e3c03cb30656f892d29384ca705f96767e5dd6d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many pointing to suspicious domains, further supports a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://acp-luxusingatlanok.hu/ckfinder/userfiles/files/kesoxilibinad.pdf In PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/zenujenowasilen.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/47109134917.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/dezurutatenesunelajir.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/zawofofuvo.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/gokogepe.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/zakup.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/89284671965.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/8555077584.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/tuxag.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/solowevutorajawufisure.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/49997484937.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/ragidujojolaveravubanuli.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7dd7bedd4a0d9744afa47c610c6614ec/wewamaremon.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/59533436137.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/42112835924.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/juvadawuzimusot.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/20670813919.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210910231520.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/difonunofosewaluge.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/vakijesewesewuxagafif.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/digidutalerip.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210906073818.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/werenibutigejasez.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/wodomikaxumuxapi.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/medapujimexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=harry+potter+and+the+chamber+pdfPDF link annotation
    • 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_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 17092 bytes
SHA-256: 96fa22b146132d72081fcd79a11bc18c0d70cdab54e974b222686b762a22b599
font_01_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 10824 bytes
SHA-256: 45767ba2778e4f7ad1c5aca542273fcf645d0be6e33ac46f3d3cdf9870a32cdc