Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95c353c91cb1911…

MALICIOUS

PDF

86.2 KB Created: 2021-09-23 10:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b12520870ab1feac6c853b6b4fdc53b SHA-1: 42845f49050bb66564f043556ece822c34291fab SHA-256: f95c353c91cb19116cea20a735db51dcda7f8c1853440f8aa77ba8b335bae6f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

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 http://www.sname.org.tw/sname/ckfinder/userfiles/files/2861342664.pdf In PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/misikeromeritoru.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/gonilidogapozegemenitukaz.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090917535185.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/26372945733.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/mivilegodoviwolekifuzu.pdfIn PDF document text
    • http://adriennemason.com/assets/files/59905476020.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/55628565199.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/kituragubokun.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/vowiretavobozatapemalona.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/6047282038.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/68687825542.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/53658140229.pdfIn PDF document text
    • https://badrivishal.com/media/letetezuvifudul.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109121218178030.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/dilavopibupilegadu.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/61979683550.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/fowosukisumu.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/xenugovitex.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/82457248999.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/vavowakagofe.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/25896276029.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/59542680379.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/68232006907.pdfIn PDF document text
    • https://ancoraeducacion.com/images/27146988184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+torrent+android+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_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 10396 bytes
SHA-256: 6c2e6c09a3f048dcf265f52b4e4a2cb3914978b9624ac83b8344db9c0c19e50f
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 20564 bytes
SHA-256: 239a20c4762c76ecda10787b378ec582ce42b91c506d1df78127d4f06072203d
font_02_sfnt_off000132d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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