Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5ee69f39347255…

MALICIOUS

PDF

72.6 KB Created: 2021-09-13 18:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac3a29a7ec39578e74fe63f528105851 SHA-1: efe59cc6b7c6f4582c6571bab118e467d4b52b0b SHA-256: 7f5ee69f39347255f76979cfa0b42b4534ce839555c6c9942777af7a1496527c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains, and is identified as a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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.
  • 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 http://uco-kampen.com/media/files/74691902265.pdf In PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/gotuzonawaw.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/6117427207.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/litapavutikukux.pdfIn PDF document text
    • https://mar3ol.com/Files/files/molik.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/36551429172.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/19528012350.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/kasowaruxudejokakodobif.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/72836447016.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/togorikejuva.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/19211072120.pdfIn PDF document text
    • https://olterus.net/contents/files/rabixubizalixisagufusa.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/acc2b44e14a6648f101dbff34244934d/77576786499.pdfIn PDF document text
    • http://dalaichau.com/files/bisorevubefujagapova.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/diluxokowebuxuj.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/naxefumapise.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/70368938649.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/famiw.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0c4b66d5---gojeselejetu.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/64467259887.pdfIn PDF document text
    • http://www.celso.org/download/jofijugupifopenexisero.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/dorusefe.pdfIn PDF document text
    • https://path.mn/userfiles/files/20973981515.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/90648364949.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/14474195013.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/kizapapus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=without+me+roblox+idPDF 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_off0000bb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 10412 bytes
SHA-256: 6e17e5c658f39511d9fa108208e868f40e84a3135d6a04ca4e47a6fda7aeafcf
font_02_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 16200 bytes
SHA-256: 3b6a48bd957997af38bbd1a863db07813c6973a2f6931671658821baa377775e