Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a030c3c7128e3c8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 16:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 336e0819862850ca04a0d5b96b86a82e SHA-1: 380bdb8ba4fef50b1f25ecd02fc1eb4de3a6cb09 SHA-256: 1a030c3c7128e3c8dfbd01009ee504ae1e31966af728eaed4f8fcd4290fa4dda
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs pointing to disposable domains, indicative of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://irlanc.ru/uplcv?utm_term=sword+art+online+season+2+eng+sub PDF link annotation
    • http://unibeauty.com.br/ckfinder/userfiles/files/66945151945.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/nobasobu.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/sinoropirelemaridodif.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/sowexaj.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14018f2b1---wasovitak.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/narenep.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/40711586313.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/57249159880.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/miwuragex.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/nomijuzumikaturapulodaz.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/xasikumivoxevuwameruzowop.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/20443660044.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/78764890131.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/98074168145.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/22886824256.pdfIn PDF document text
    • http://airmon.hu/images/files/ralaxogajasabevebuxexuwon.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/pexuxawi.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/20143710076.pdfIn PDF document text
    • http://seto.cz/uploads/jimudesovimipa.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/88799132193.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/junurowevujisen.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/ponugegivobimitazobipiso.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210917045327.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/xuvelomunubovaze.pdfIn PDF document text
    • 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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 10944 bytes
SHA-256: db1d8c467c2c20f6b5a821f955d80a48de1c0936a3571aea48a705b85d1576c5
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 15628 bytes
SHA-256: c2256b1a0b6f357e2e2536f555b2e4bcbbac78c5ac145e08eaf6bc18a3990358
font_02_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1