Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d51d9551991bfad…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 01:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e064bc1fb53f6bfc41608a5ab6b2d89 SHA-1: 16c08b3025a56d2ef5c6dcaee79eb6f2bc5186b0 SHA-256: 8d51d9551991bfad672d41d0a4a937195aeb7bea1dca4785ed75ec69f63b99fe
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it employs a social-engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware delivery. No scripts were extracted, but the presence of external URIs and the overall detection suggest it may lead to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/57992647043.pdf In PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/91074024223.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145645ff1f89---wigamigofidopotidatud.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sj1ki6ulgat4j91h6549u3j4f3/78222063508.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/7995679304.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/99802440036.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/89280267875.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/37151341515.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/34148359725.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/69308284550.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/76551695525.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/jedetogoga.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/66448444047.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/gemeduwu.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/dorefub.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/98940669964.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/punagokid.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210903035154.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/91853841756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bookmarklet+chrome+androidPDF 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_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 17536 bytes
SHA-256: 1575ca7bfd41e7a449dd2480357d1a02b70dbac49e1303bec25ed566aa4b24bb
font_01_sfnt_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 10612 bytes
SHA-256: f682ad6df7dd9757778cd2831ff1310854b1276555c7e693c290bb4f84b5599a

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