Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea325a64d9338955…

MALICIOUS

PDF

75.9 KB Created: 2021-04-07 16:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ad18e3096240447742eb48812d8d3a1 SHA-1: 217286d590d5e937e2983ccd6c80b30b3eb43c61 SHA-256: ea325a64d93389554e2a66649c2c3c3d14e46796cf22fdb116b46f1a0b8770ab
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=how+effective+are+citronella+bark+collars
    • https://cdn-cms.f-static.net/uploads/4419846/normal_5fd8a2de35405.pdf
    • https://tavigawatogup.weebly.com/uploads/1/3/5/3/135389884/3766971.pdf
    • https://cdn-cms.f-static.net/uploads/4379474/normal_6063b9e024440.pdf
    • https://sujuxeneme.weebly.com/uploads/1/3/1/3/131380470/fajejapowexufa_wipuxadanum.pdf
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fccbc1d49a31.pdf
    • https://wadamosemexijep.weebly.com/uploads/1/3/4/4/134434227/1250400.pdf
    • https://cdn-cms.f-static.net/uploads/4380214/normal_6023b851e4d1e.pdf
    • https://static.s123-cdn-static.com/uploads/4468819/normal_5feeac03a369d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://baxolorojujore.rf.gd/catalogo_cedulas_do_brasil_gratis.pdf
    • https://s3.amazonaws.com/sajezife/95134195700.pdf
    • http://wuzorijo.rf.gd/leaf_anatomy_diagram_answers.pdf
    • http://gerutinikokowa.epizy.com/konsep_bilangan_bulat.pdf
    • https://uploads.strikinglycdn.com/files/9d7eceba-4992-4efa-9d99-42d39a431c39/ford_3000_vs_4000.pdf
    • https://uploads.strikinglycdn.com/files/887f5380-f230-4591-80b8-6a8b6f4d4a0a/how_much_is_a_breville_juicer.pdf
    • http://relizaki.epizy.com/edelweiss_general_insurance_company_limited_annual_report.pdf
    • https://s3.amazonaws.com/kakekojezutok/15398192249.pdf
    • https://s3.amazonaws.com/luropiw/microsoft_outlook_2010_preview_handler.pdf
    • https://s3.amazonaws.com/pigolo/why_is_windows_server_so_expensive.pdf
    • https://uploads.strikinglycdn.com/files/ca139751-fb42-4df2-949e-768c5242f0ec/desiwikegotezanoru.pdf
    • https://s3.amazonaws.com/kudefem/kss_ltd_annual_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed21.bin
51dba907231879e9dbdcd98eae0aa3e07019b3b53a2878209a13ec8f9c9c7a06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 5192 bytes
font_01_sfnt_off0000fef8.bin
4af83daac17a7129aa4aea375a8f74c2753945a2fd24f789df74dc6b8f2b450f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 10312 bytes

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