Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c61d36800fbf07…

MALICIOUS

PDF

89.9 KB Created: 2021-09-14 06:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eea33c1ea050d75fb49a710b48f96fec SHA-1: 479dc3be1a01ea01d974aa48027565addc6118af SHA-256: b6c61d36800fbf074157662205209e3bf7e49f856f3958f09b7a8862f1395fd0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to potentially malicious domains, indicating an attempt to redirect the user to malicious content or download further payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • 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 http://burragebrothers.org/demo/jolie/beta/userfiles/files/93596322707.pdf In PDF document text
    • https://tannhatviet.vn/upload/files/vapus.pdfIn PDF document text
    • https://x-software.cz/data/file/88710935479.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090302110373499.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/40508716266.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/pigoxojejemexudovujunonox.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/bejotetututebaxomit.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/15602570818.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fatexiligumu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613443ad06d0b---vagarulilemubawodu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862c184ad0---nujomokis.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/lekixazolukavukoz.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/lujogalivefi.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/kuzeti.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/gumaliso.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/lokaf.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/manodelemutivu.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210907204559_xjkydc.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/84894198120.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/49097232142.pdfIn PDF document text
    • http://malifer.hu/upload/file/xopesivupimulududusixunuf.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/dopov.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/76865865108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mia3+miui+12+updatePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/52260760950.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_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 18844 bytes
SHA-256: 0b530358ed1a7c5523697074b8462aaa4b3f1cca57be28c37f83d90a34bbc064
font_02_sfnt_off0001425d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425D 10452 bytes
SHA-256: 9d30f2ca89965385c01beee6442e348c5d0859d43f728bb5796659bb6f54f008