Malicious PDF — malware analysis report

Static analysis result for SHA-256 c446eeec8dae33c0…

MALICIOUS

PDF

70.2 KB Created: 2021-03-30 09:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fddeec47f05afce6dce1eba19f6b88e4 SHA-1: 983d43918097809b3700715907450cc0a9b5a1be SHA-256: c446eeec8dae33c0e3ac9dbfa3eb80ae6dca12420dafba8ad6df20d8f51a41b9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many with numeric slugs, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of embedded URLs points to an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=playskool+lincoln+logs+instructions
    • http://mowefopovog.mywebcommunity.org/13068189651.pdf
    • http://zujadise.scienceontheweb.net/dezat.pdf
    • https://cdn-cms.f-static.net/uploads/4456165/normal_60377f7841978.pdf
    • https://cdn-cms.f-static.net/uploads/4447280/normal_5fd6cddc24957.pdf
    • https://cdn.sqhk.co/muligumixe/gdEieKm/falisatenowezajekorajanal.pdf
    • https://cdn-cms.f-static.net/uploads/4393363/normal_60405851aa5a8.pdf
    • https://cdn.sqhk.co/guzoladip/hhaSRie/nobodies_murder_cleaner_mod.pdf
    • https://cdn-cms.f-static.net/uploads/4401732/normal_60163bc46d8a3.pdf
    • http://jirogiwewobifer.iblogger.org/livro_qualquer_coisa_serve.pdf
    • http://dusanaputojinon.mygamesonline.org/microsoft_sql_server_certification_path.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_63a02ada0a08478c86649f579414283d.pdf?index=true
    • http://faberaladaruz.epizy.com/systematic_theology_erickson.pdf
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_30781f870cb046738bf8e2c0a74ddec7.pdf?index=true
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_e7f18dd935d34cfd95b5636fffa0b80f.pdf?index=true
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_9224725e2cd44f87b2edcb5e49e65c6e.pdf?index=true
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_d9236593c3344d5b90f4124c18aec232.pdf?index=true
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_84b12b1f5adb43d187cf2751c9539ff1.pdf?index=true
    • http://zerakunutage.epizy.com/ccsu_b_ed_admit_card_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa9.bin
a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 2900 bytes
font_01_sfnt_off0000d4eb.bin
44767b2c183960d0a3d23e77a95ea7f2a9707f5d7d4ee44ff25e2239238bddf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 5136 bytes
font_02_sfnt_off0000e67e.bin
85b3c06eeb5833f43b1727a37eba50b8e1cc4310cdf38fd6cb6d237879a0a1bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 11352 bytes

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