Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf2300014e193d7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 12:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2cc4921bc4a37cecae1696025523c13a SHA-1: 4bd86a325e653b9214526b05f510a34c2458cf9a SHA-256: 0bf2300014e193d77109de9f20bf52617494a7fe1dbca356adac7cc67deb6b5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also contains numerous external URIs, many of which point to PDFs hosted on disposable domains, suggesting a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/pulapajuruwegagigepuw.pdf In PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/tanuvuwivibijeporalijodu.pdfIn PDF document text
    • http://unseretochter.ch/images/file/71516674046.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/96314777968.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/pabosojibemitugeguz.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/budomemobisoforuvutusan.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/52615776493.pdfIn PDF document text
    • http://iucecb.com/files/file/seravabiviluraramilor.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8379991985.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/godovutuvetuwak.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/31401044725.pdfIn PDF document text
    • http://deltools.com/userfiles/file/53256305405.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/92206316065.pdfIn PDF document text
    • http://minhanh.com/files/98723413378.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/fagaresuwub.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/23041614350.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131192727eda---23403095594.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613468b815021---62483101337.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/namifo.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/19459076080.pdfIn PDF document text
    • http://saktigroup.in/uploads/14922089772.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/xetivivanasosawolak.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614086b3435c6---sizokiwososigikegoze.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/92776286562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sonic+3+download+apkPDF 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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 17520 bytes
SHA-256: ba04ecbf34efbbdb698160bff14667aacb8f5c72103c904d9c6e8461e733b111
font_01_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12088 10436 bytes
SHA-256: 49769d19c0a972fe77060c45329d639910f42e3ae8c8ec3a35645b9c9a3c88cb