Malicious PDF — malware analysis report

Static analysis result for SHA-256 012b2debdcc6a02d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 06:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a43bdc1f305901b5a3380e17411a16a3 SHA-1: d5cf0e00a26cf4312df3858a66f0ced6e77069c2 SHA-256: 012b2debdcc6a02d5a2976dfa47c789dfa04c53d10f35f27672f0966805e0680
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://de.ruben.pl/ckfinder/userfiles/files/mimageluwujefekidi.pdf In PDF document text
    • http://avvocato-callegaro.it/public/file/28323028997.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/zuxus.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/84450016827.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/kowevujef.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/pupuka.pdfIn PDF document text
    • http://zgic.ru/!upload/files/dimagafoji.pdfIn PDF document text
    • https://penal-garazh.ru/files/panejipele.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613486b3215c5.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/96021277543.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109121322456928.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/59108051133.pdfIn PDF document text
    • http://btfa.tw/upload/files/12352720962.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/50404338820.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5f34b379---48013389280.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210903_F209338F4D4A07F5.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/43272752362.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e88e55fe85---27464876463.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/55723774261.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/bufaladubobuwidix.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/nimomoselalefosozapiborov.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/79719058821.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/28662998645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=five+nights+at+candy%27s+download+steamPDF 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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 17728 bytes
SHA-256: 5daa2fc552dfce6cf867c0859ca3c380ec69284f66972e85e100a15081c1a18d
font_01_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5C 10996 bytes
SHA-256: 2a64240fb2775cc4d9fd7f02bf94b83f972bd657ab5aeb9806a66774ba5273c9