Malicious PDF — malware analysis report

Static analysis result for SHA-256 631df2fec029d964…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 04:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d0258b24240e3525ba103af1c8f688b5 SHA-1: ed3db26d2e1329556b6d492cc3a5fcec6c28989b SHA-256: 631df2fec029d96436d8a0c9f7675aa836f225cdd6b3707a3b516216948baf0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to obscure malicious destinations. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns strongly suggest it's used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://bankerz.in/qpic/files/tibemamisutuvaripunet.pdf In PDF document text
    • http://quangphong.vn/uploads/image/files/17096116997.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1v72u0icl3o5uao43b5f7ve873/25235533043.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210911065259.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/90555829893.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210913_075124.pdfIn PDF document text
    • http://placc.info/up_image/vitosomebexojevewewakinaj.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/66494393436.pdfIn PDF document text
    • http://koutingchina.com/upload/files/8292686050.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/8322806029.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/92342957537.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/lipewupoxesiwutimanidate.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/68314389643.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/kumevomelelofarume.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/sufodivavelulewajeb.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/33114653465.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/82726829126.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/68787967269.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/rovalemodake.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/zetomofebafozaso.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/60769928856.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/jopelosodukejudotu.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/83297562417.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a141656b84---rawup.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/10489837864.pdfIn PDF document text
    • https://sim2007.com/files/zutafus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=play+music+on+my+android+phonePDF 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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 16456 bytes
SHA-256: 4b7592d3962611fb06f62868cc8c837c5def85adb14ff492df807f3b57733ca1
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 10896 bytes
SHA-256: 493b43361b33b902da54f748524b354d78eeb20219aec965b35e4a35fe07cede