Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df76dc195c9d76d…

MALICIOUS

PDF

76.6 KB Created: 2021-03-14 08:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f3adeb5403c8947661ef4052c907241 SHA-1: e4ed826229a76b9ddc2e5760059c26321aede9bb SHA-256: 7df76dc195c9d76d19078dd8392115c3e0355fe2ad0a10253d8e22c9aa2f0769
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'Kali linux backtrack 5' and authoring application details, which may be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/123?utm_term=kali+linux+backtrack+5
    • http://sakivometo.medianewsonline.com/79091979184.pdf
    • http://xomerisupudegop.medianewsonline.com/xudowawufefijadumowuja.pdf
    • http://sivolejujivozul.scienceontheweb.net/modal_auxiliary_verbs_usage.pdf
    • https://cdn-cms.f-static.net/uploads/4453891/normal_6029543691053.pdf
    • http://wirobigi.medianewsonline.com/buzutarunedodalewek.pdf
    • https://cdn-cms.f-static.net/uploads/4379855/normal_600c569a5d7e0.pdf
    • http://torixewiser.medianewsonline.com/8528429420.pdf
    • https://cdn-cms.f-static.net/uploads/4376610/normal_60450d70e873d.pdf
    • https://cdn-cms.f-static.net/uploads/4413867/normal_602457d92dd64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://buvazow.epizy.com/dumbbell_exercise_guide.pdf
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_710489dd02ac46fb8ad156e5d3bf4ee2.pdf?index=true
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_4c77475a138648028ad5b832ead702f6.pdf?index=true
    • http://benepuru.epizy.com/audit_report_filing_date.pdf
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_57f340951c99490ab6fc696135e4d7c2.pdf?index=true
    • http://suxubijutun.rf.gd/gw2_skyscale_fever_guide.pdf
    • http://senoburem.epizy.com/titan_440i_paint_sprayer_troubleshooting.pdf
    • http://vosowetawevu.epizy.com/28782404395.pdf
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_af4627f7829f4ad6b9ad0c27bf243cee.pdf?index=true
    • http://lepalatibig.epizy.com/salasowevofuravisidunijab.pdf
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_6f76be3f59e24a1bb0cc75a64c20a0c4.pdf?index=true
    • http://guxivajigiziz.rf.gd/diruxagonuvekijome.pdf
    • http://bavotuvezomevi.myartsonline.com/what_are_the_three_main_parts_of_the_mission_system.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_off0000eef9.bin
1d03cd3d62d6da8fe6b7c52d0648776393fef4573f18aa0f3b6b1632fdc0dc8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 4980 bytes
font_01_sfnt_off00010001.bin
b7d16deac952cfcf229da60fae1aa1017288cb4ef0af90e209b302985a82de15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10832 bytes

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