Malicious PDF — malware analysis report

Static analysis result for SHA-256 947b59b195d01c25…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 20:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c960c09b9b7f3d336b1390b809e0012 SHA-1: b7acfc939bd22a772f2508c091b159cfef3384b9 SHA-256: 947b59b195d01c255a0670c6d3286bc67298a8318c187c22a07c69cebcdbe550
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the PDF is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133f98094b13---17223048384.pdf In PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/vabakizifixopedobuwigaru.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/dibijexewinaj.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/ramivukulegu.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/64465520689.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/kavakewojoloxew.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/40240971604.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/piferumetufawugikaveneje.pdfIn PDF document text
    • http://email-database.info/userfiles/file/boluzovopenifizelogam.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/67562497473.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/89092613799.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/vunirafamenadu.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lifezugigejawaxoliseputap.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/76555970279.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/gikuda.pdfIn PDF document text
    • http://retailcop.ca/files/39678305348.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/dunojiz.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/buxolulimuwejajowupo.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109081648107716.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144b157a5c92---durinaderiluvomelu.pdfIn PDF document text
    • http://onlinevay.com/upload/files/suteru.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/21579688738.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/mosovugulul.pdfIn PDF document text
    • http://sivam.pl/files/file/vexusu.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/mepixunotenusamaninav.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/nevatenoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+record+pubg+mobile+gameplay+with+internal+audio+on+pcPDF 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_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 11224 bytes
SHA-256: 58d0e4b8af20d5cff0060b1f4efadc2cbb68554ef14a3fb667bb58e3e88dc53f
font_02_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 17888 bytes
SHA-256: 9f117a0ce409eee97ad9fcad51a819e46cbd3a34b6628bfa74e3c5bbf0c0d178