Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f3c535a5c9d3b7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 08:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 195cfd61ee0d16621abac7af14e34c8d SHA-1: 1e8c7e7fa95f289d325696f82d2afedb5df3c41e SHA-256: 14f3c535a5c9d3b7f149ebe2364eeb92ee20c1a506c12670c5e6b63cee75db19
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to redirect users or execute further malicious actions. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting a tactic to manipulate search engine results or distribute additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gkz-crimea.ru/userfiles/file/90873767229.pdf In PDF document text
    • http://weifong.tw/fckimages/file/xekonevojakaxovo.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/wosilotabuviduvipefow.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/narefose.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210902185740.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/27431880807.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aabce96fa8---vobumo.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/ratidowubuvitofa.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/dafuwujenuxiki.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/xejelawakopevur.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/dokesafalov.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/44867366782.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/92618268906.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c6qrcjecfi7ktfh312sgkmlc4o/73054792462.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/givipogovasasir.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/xusaretekixasuvowepi.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/gedegidarapofefapugaras.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/69469546808.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/sadebaxogumatokudof.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210906133119_699061.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/38139612032.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/sixukap.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/82506628655.pdfIn PDF document text
    • http://adriennemason.com/assets/files/28145520393.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/bulibisozoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+v+online+is+freePDF 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_off0000b5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EA 15196 bytes
SHA-256: 6aa36e1dfb9efea6eee9bf775d4c67a9a9c9e5e88d75991a06aefd84f08a6dab
font_01_sfnt_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 10312 bytes
SHA-256: 384cd55ddb2b805e33d0189ffc062b466b13bfd55e6f47fb50d323a9c9c10982
font_02_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1