Malicious PDF — malware analysis report

Static analysis result for SHA-256 5feb7c175aaa61a2…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 23:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 73cfd9debbccbd3a4e6d5a469f2210c8 SHA-1: 24dbf159eecf6bc7f9fd395d3030ac5fd1252676 SHA-256: 5feb7c175aaa61a2ce257f28efb12582b91b4550fd43e7633c604acd9c6937ef
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a common PDF-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=us+army+uniforms+vietnam+war In PDF document text
    • https://cdn.sqhk.co/gufezitaxato/thiPijI/popobovibetowofu.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/how_much_does_a_catalytic_converter_cost_for_a_subaru.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/rope_knots_for_mountain_climbing.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/ohjgegh/67518676461.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/UgeQphj/94269462589.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/fgfd3QE/fokoxanujotena.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/39670608703.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/h6ejgOn/wuvopiti.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/Bc6igMI/87681714712.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubelifijam.atwebpages.com/ao_del_modelo_atomico_de_dirac_jordan.pdfIn PDF document text
    • http://lukugebov.rf.gd/stihl_ms_271_vs_251.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/what_does_the_bible_say_about_jobs_wife.pdfIn PDF document text
    • http://jekutekovemimav.rf.gd/59966074757.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/85755281902.pdfIn PDF document text
    • http://menaronutex.epizy.com/9021031927.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 5128 bytes
SHA-256: c2581d9e013a9d34993fdc6a8a59bdb40aabf90486c6794dbadf227516de1eab
font_01_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 10492 bytes
SHA-256: e80c7cc386d0bc994c12b320c4111665856d024570165ab26f4769c06c3e59ad