Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfea618e3ac3eeaa…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 20:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 903a8a7c55926d5fd0cc941aa1941feb SHA-1: 507bad102f0276096a1ff55fc3c29e6d125d4eb8 SHA-256: bfea618e3ac3eeaad1f5a4c54b2cc781e4d1320c01e4aaba0955524657a03cfa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially malicious or disposable domains, suggesting a phishing or spam campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.pes.edu.mn/ckfinder/userfiles/files/38522950160.pdf In PDF document text
    • http://www.luna1956.com/images/library/File/tujabagul.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/24266473278.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/fuvebuwun.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/bevabebinew.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/tidoxapofukud.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/10463525059.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/94301538839.pdfIn PDF document text
    • http://geotersrl.it/file/xupamozotetukagu.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/wexokegibuwomulalu.pdfIn PDF document text
    • https://eclearusa.com/images/file/sudubamamowixobesoko.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/lenimatokiwegirasamoji.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/91867805026.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/58724800928.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/mugiwovufadazexofitife.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/7196284456.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/7899190507.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/10018987077.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/7b5c034b228ab629cbbc43abc10cd004/dusofutukedijuwafikuboluf.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/24479340143.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/duxinadesuvi.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/pidosedonixi.pdfIn PDF document text
    • https://digireg.at/upload/96525218963.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/91026996658.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/mowipemegafanav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=face+video+editor+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_off0000bdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCE 10324 bytes
SHA-256: 78f3c06e83155aa19af800c292f62d51539b6c80a1fa1dd5d6796580377af70b
font_01_sfnt_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 18984 bytes
SHA-256: 274653fd6ad8ec9cd4f39da55a27cbf260d306e5dddbf414dfbaffc013158d10