Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc606fb4e6b5c24…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 23:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 048369537a4009188cef3b95593e256d SHA-1: 28c3e26a505f8183ba0a76e7d54acf74d89bea2d SHA-256: ffc606fb4e6b5c24e50482e0dfb39a0a14e2b7010d1aa46141295f52794e66a8
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm hosted on disposable domains. The primary attack pattern appears to be redirecting users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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.
  • 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.herbertvanderbrugghen.nl/draft/75012635617.pdf In PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/51903899523.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/berewabegejiruzituw.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/doxulesufajakijezomireva.pdfIn PDF document text
    • http://vladekoservis.ru/files/96979576958.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/kurix.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608066b39ead7---xesovarinaxubarinefuwo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/50795136232.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72e634603---lulovejorezekuguz.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/34736359359.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a8f4d5505e589a1cd1016c551ec6d058/navojarowezerowepeb.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/sabimakuruwagosote.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/dadoxapatogeli.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-25/20210725165205538841.pdfIn PDF document text
    • https://europartner2.pl/uploads/34426364426.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/81499815037.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/65207094096.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/kazolixararigoz.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/46327597500.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210706044618.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/voxefibemuvuj.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/zimin.pdfIn PDF document text
    • https://luminex.pl/upload/file/43972872516.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/28749691385.pdfIn PDF document text
    • http://iltorg.ru/upload/file/guzuno.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/67622674070.pdfIn PDF document text
    • https://go2germany.ru/files/file/gexifogivobifadama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cecelia+ahern+books+pdfPDF 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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10884 bytes
SHA-256: 6ef157cc439980ce093196223bbbcae6a2c96f004497e2d41bbf833c96aaaa80
font_01_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 17212 bytes
SHA-256: e2269ba118be820da256f6207e189cc6eec6a19784332cc8c4d1ad2c85762964
font_02_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1