Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b4123046851e15…

MALICIOUS

PDF

77.7 KB Created: 2021-09-25 07:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 548635984c84703d11dbff2146be62e2 SHA-1: 807434e7ba1061ed5f185513c9d743959db949ec SHA-256: 94b4123046851e15ee19ec1540d1fad5d59d5d8a8dd1e91bdac370bbc60439b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e469acf8e1---xuzudageku.pdf In PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/44927571795.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/foxuv.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/69134018137.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/31494154170.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/1723536844.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/muwum.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/74563535645.pdfIn PDF document text
    • http://yejida.com/userfiles/file/91838641471.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/36066785918.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/071730079872.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161337e967e6dc---53510896876.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/zodizepenijafaxenixeg.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kudowo.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/88436888570.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/86305497741.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/79746173433.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/nobiwabakesivifivo.pdfIn PDF document text
    • http://zmz72.ru/files/file/vubidumuduranarukonigiti.pdfIn PDF document text
    • http://cecev.com/stockages/files/potuxeda.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/fukupok.pdfIn PDF document text
    • http://wmsone.com/eimages/file/vovisapetajesela.pdfIn PDF document text
    • http://citranco.com/users/files/55226612456.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/99871616155.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/88271426467.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/55317636769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=super+mario+bros+deluxe+gbc+romPDF 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_off0000c162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC162 11072 bytes
SHA-256: f1b0340d5b7d202c29f0242edda7c13c939cdc0fe8e59a3f539b2dd22585ad77
font_01_sfnt_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 20616 bytes
SHA-256: 007ee79c64453a1f59b5c77a56cc100e958bcca6cd4f60c80cf81a41df0f6835
font_02_sfnt_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1