Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8858714a8f92d42…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 21:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcd4f8e2e58ae6c0166c6709bfd29134 SHA-1: 2cb9262c8680cbf419e2f2d9a8816319485f7af9 SHA-256: e8858714a8f92d42b0663ca76256715995523007a42b1fd69c406ad7998215d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=application+gps+poid+lourd+android PDF link annotation
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/lusavubuxiganepexe.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/39291589014.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/nutabuvipidenuxakoba.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/55933118131.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631001897.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/vemulu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614720ac73344---56053724681.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/90471314416.pdfIn PDF document text
    • http://beiks.info/public/file/32725952266.pdfIn PDF document text
    • http://raczcsalad.hu/files/64846750548.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/24963044985.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b05783ef---12389671589.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/lilotox.pdfIn PDF document text
    • http://villkasz.hu/editor_up/43071986544.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/soxoga.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/22021935312.pdfIn PDF document text
    • http://vitrine-prof.com/files/sakep.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/57024595218.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/14569510490.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/bukibimuropak.pdfIn PDF document text
    • http://vitrine-prof.com/files/20212872636.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/58776902858.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/fegixefa.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/10189339270.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/gujosapemoxorub.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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 10640 bytes
SHA-256: c85e451c5c3a9496cfe5490b857e3ef4b3b41098977f48a4373f0b93cf704918
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 18200 bytes
SHA-256: f598511135831b60373d6deb9d5600b66fd487bf37db969c1147087db7af081f
font_02_sfnt_off00012170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1