Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1927d12eb0eb366…

MALICIOUS

PDF

65.2 KB Created: 2021-03-14 14:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b88bd07d74a231b29cad9ef02902820b SHA-1: 2f207518ef8cd21e300cfd28d974a248d57492d3 SHA-256: b1927d12eb0eb366cd3cba4e04dc48aa63548d90b81259413512cab266ed033e
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the presence of many external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

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
  • 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
  • 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://botokaw.ru/award?keyword=english+crossword+puzzles+with+answers+for+class+7+pdf
    • http://jotitojimo.mygamesonline.org/jeppesen_private_pilot_textbook_ebook.pdf
    • http://fejukoturig.medianewsonline.com/24776298018.pdf
    • https://static.s123-cdn-static.com/uploads/4492580/normal_5ff4cb12ac7ff.pdf
    • https://static.s123-cdn-static.com/uploads/4368222/normal_5fc711c59767d.pdf
    • http://rotixumuzu.22web.org/tubijef.pdf
    • http://luxasireku.sportsontheweb.net/2013_dodge_charger_leather_seat_covers.pdf
    • https://cdn-cms.f-static.net/uploads/4424689/normal_603142ec08bf7.pdf
    • http://bezerojiw.scienceontheweb.net/nawupamujerekopod.pdf
    • https://cdn-cms.f-static.net/uploads/4454995/normal_600cff2b1c609.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vujapoguxesak.myartsonline.com/zoxiliburipixokejilikeke.pdf
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_33cd8e21ac7a427caf75416fd5ae2ec9.pdf?index=true
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_c72c963eab1c4662accfec41ba5786ca.pdf?index=true
    • http://budivisatenebo.rf.gd/phd_in_operations_research_and_financial_engineering.pdf
    • http://nivufebolira.epizy.com/alivecor_app_for_android.pdf
    • http://nununad.myartsonline.com/52935972548.pdf
    • http://runapapaxezupow.rf.gd/avast_cleanup_tool.pdf
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_88e127529c8f4eb98dc58ac7b047feba.pdf?index=true
    • http://metusajixano.epizy.com/printable_car_log_book_template.pdf
    • http://jisexapegumet.rf.gd/21902564075.pdf
    • http://wovovaj.rf.gd/87372526020.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d178.bin
c4a3421e8512fcc04068100705afb1d6d21e15d388bd473e07a3ae99ad02e518
pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 5596 bytes
font_01_sfnt_off0000e4b1.bin
4338e1e13accedd15d218b8844c035cb489fe5ff1b0c675491d84eaf57343aa1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 10188 bytes