Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb25d9e308d46829…

MALICIOUS

PDF

73.4 KB Created: 2021-09-12 06:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc2fe5fd1cad68b726f6f2fa294b11f2 SHA-1: f8073f2d80eaeffb843dacea2b0e14db7f001f8c SHA-256: cb25d9e308d468290f7be0f598ea4a836da1743ebb6a36fc99fce187cf4c86ea
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=spider+man+ultimate+power+apk+download PDF link annotation
    • http://unityproductions.com/upload/files/58782970474.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/daxeloregakojunoxifif.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/18563866726.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/59276675298.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/widodanodigiropixo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b709fc28aae956aa90c71910d349a6c/43105219203.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/19036413872.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2c725b50---57934011682.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/wuvixokimozebunorofesi.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/funipukojezobisim.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/35232247300.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/salerogudenob.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/zaxaripotezulekanumokasap.pdfIn PDF document text
    • http://mq-water.net/upload/79252261050.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/lejekokiforoneseza.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/bebikirose.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/vatutabilalililopomojuf.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/gofebawib.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/70172310029.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/logelekojuriwotetunezu.pdfIn PDF document text
    • http://keitbg.com/images/files/mezenopezuzezamomax.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/20113255696.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/90969166034.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/raxuzudojajizodagaz.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/kagidebidaliwekedefuvo.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_off0000bdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFF 10736 bytes
SHA-256: 7bc11a8b981eb7385922846f682c6c1a8233fedbf6aae5335420876756e12687
font_01_sfnt_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 16536 bytes
SHA-256: e646b4d721d0de0bf8a08dd9fd980cb59dc11bfdc815a441f95189d6141425d4
font_02_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1