Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa74e79825bad391…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 11:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5658cc3ad36600a2d890ad1db100dc6 SHA-1: 2378ceffb9bf4162a3680d12d00450b668510fe5 SHA-256: fa74e79825bad391a74cb70246e55e04a666cd85fb92a02e70efea0484e72b25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high volume of links across distinct, potentially disposable hosts.

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://intemhathanh.com/img_duhoc/files/16023962362.pdf In PDF document text
    • http://hilimall.ae/uploads/files/zawomopanafubudesemunebed.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/890836835.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210909_091334.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/11830350812.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/buvusebe.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/35168534710.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/443393938.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/6869857574.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/bifizozawazig.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/vosobuwit.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/vimoto.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/jozuzinu.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/xeneto.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/54483228709.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/kabasokadopozuteba.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/bamogufor.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/jisexalagapepoboretegi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0e9eebd05---21596503308.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/tekan.pdfIn PDF document text
    • http://mariancozma.com/_user/file/95482043604.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/66072962414.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/jegikutunusonivikugofek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=roblox+gift+card+generator+no+human+verificationPDF link annotation
    • http://irodori.kir.jp/files/file/lakufup.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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 17540 bytes
SHA-256: da47bbdecc6b6c2a57be7ec3eae923a2d7ddd2b2bdfe97403f3b8b0ccf6898dc
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 11208 bytes
SHA-256: 883e797b69cdce0f593ed2908766059e93e5addd47e9fd0f4f69318355267dc6

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