Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca005c1506e35147…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 12:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d9c82991b0ad8ab791a4817f804d648 SHA-1: fea904ed4a9b59ff9ee9a5639559547604c3b903 SHA-256: ca005c1506e351479e9f0093a819ed3cb1d67df38fe794eee66650667d0d73c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high concentration of links on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://brukspec.pl/upload/file/muzevojorakavutakaxikagoj.pdf In PDF document text
    • http://www.520amis.com/upload/files/59965874866.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/gatemunilegulasaro.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/nadikifesajiver.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/fujunonozurizewubax.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/18188444626.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/57275703372.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/61594741777.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/tifisi.pdfIn PDF document text
    • http://esen.life/userfiles/file/92571301603.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202195187307593.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/lezenegivo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613203f03e021---42093503055.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/69668376481.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/bopivaxulugison.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109041851121036.pdfIn PDF document text
    • http://timebymtm.com/upload/files/guwejebiteribopuxelo.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/198155699.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/84095684836.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/jigirovukadifak.pdfIn PDF document text
    • https://satyawatioverseas.com/userfiles/file/87848666448.pdfIn PDF document text
    • http://grupophi.es/uploads/files/3778993027.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a082f9abe0---75334414625.pdfIn PDF document text
    • https://airxps.com/userfiles/files/18484145985.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/veniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=unofficial+android+app+storePDF 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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 17280 bytes
SHA-256: 678561f58163df1122d60a8fcf304942e83b1537dfc498ddb41827519b61d36f
font_01_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 10620 bytes
SHA-256: d60960957968fd36bd4173945123d8a500192653fafa54c90e77587d434673ba
font_02_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1