Malicious PDF — malware analysis report

Static analysis result for SHA-256 995a260f97b6ad05…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 15:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e73ea22d3fd97a3f679ef8185da2d791 SHA-1: aab040205751bb835bbd580186b811cc0e2a104f SHA-256: 995a260f97b6ad05923ec7a312aa8e51d8c02ed3ef96cab86a8f596aa0dd7c82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, many of which appear to be disposable or used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=sao+war+of+underworld+part+2+episode+4 PDF link annotation
    • https://mallenmediations.com/mallenmediations/images/userfiles/file/73362119035.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/95343084445.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/74046151635.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/10198322741.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/59335838129.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/1116530875.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/27342711694.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/juvam.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c834456d---wufotukobemajofuvit.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/sekizatesizegupedulalode.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/butiwaganizep.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/95139949813.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613508d491a31---54359154174.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/molejababufizipevage.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/dolizo.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/14368638195.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109161356056166.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/ferimatibupexo.pdfIn PDF document text
    • http://stpogfzz.com/attachments/202109/editor/file/dujezudof.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/pujivuvegalaf.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/41928861255.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/85215896183.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/60918291065.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_off0000b57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57F 10948 bytes
SHA-256: eb4b4e0891e609496e91390d3834e25207c0116a7afa13606a85af1956d36da5
font_01_sfnt_off0000cf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1E 18172 bytes
SHA-256: 2cfc245000a05b71234be952198080275c41cdb57557e65e69e270a128a9145e
font_02_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1