Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d9626d08b12675…

MALICIOUS

PDF

82.4 KB Created: 2021-10-05 05:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7dd12500c2ba24cb3680994773fa79f6 SHA-1: 6e5ce8b2fdce367e4bdb848b9de854067fe29c31 SHA-256: b8d9626d08b126754cedd0bde6b6a0e08090873b14c82862c8b9b68b57e70370
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains, and is identified as a link farm designed to distribute content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is intended to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/neximikizili.pdf In PDF document text
    • https://equimat-cheval.fr/file/kepemum.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/rubapidukekazavuwudezamux.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021100509281094.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109250028289543.pdfIn PDF document text
    • https://terracell.info/images/file/zefimiximumegebovotizu.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/81761522851.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/o1ludne6vtp67bb8esf7uvi74s/96786094101.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/xabotesamagudosuvuxizaxuk.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/gisudunawegubadi.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/88905247183.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/nowizelumosujutegesufew.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/giwumobexekaki.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/dovovixazapowaruwo.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/simexisekerorazozosofew.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16152653f0a99c---51321393299.pdfIn PDF document text
    • https://edgecs.com/documents/96655917516.pdfIn PDF document text
    • http://mackits.eu/image/77898834658.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/89091690380.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/mozutudovavi.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/11551550602.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/44c63ced32505069457165ef1f3b7d5a/65211174273.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/35306996427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+unhighlight+in+pdfPDF link annotation
    • https://easyown.ddproperty.com/datas/files/gajarikolevaxo.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_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 10392 bytes
SHA-256: 85fdb762e3d2606ce43913e8a8a1e2bd3bdbadc786f1fc60ad6dd1efe6e8677a
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 19668 bytes
SHA-256: f0bbf22d96b8c52e9bdde4191c2c6569f7558ea78ff850c53030d10cca05758b
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1