Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1a499aaf883fe1…

MALICIOUS

PDF

61.3 KB Created: 2021-04-03 16:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cce79fc1a008ac10cb7d95af085164e SHA-1: 68fa1c1e6e8792029bbee6987b61276710aa8ce7 SHA-256: ee1a499aaf883fe168b7187ab156d4906bae1227a27e17d7e4796e0cdea54554
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by a machine learning classifier and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the PDF is designed to redirect users to potentially harmful content. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9145

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://baarspo.ru/award?keyword=bimal+kar+pdf+free+download
    • http://tezuveripoxub.mypressonline.com/92815760191.pdf
    • http://premial.su/chemistry_a_molecular_approach_4th_edition_citationf06f8.pdf
    • https://siwelizotelet.weebly.com/uploads/1/3/1/4/131437983/fakenifaxekivo.pdf
    • http://wokulorumal.iblogger.org/free_online_nc_drivers_license_practice_test.pdf
    • http://kosamaritaj.getenjoyment.net/bike_spare_parts_price_list.pdf
    • http://vagoneviwesum.66ghz.com/dbx_160_compressor_limiter.pdf
    • http://pigetubivefenux.22web.org/can_past_simple_exercises.pdf
    • http://rigalanolupibe.22web.org/how_to_run_a_successful_liquor_store_business.pdf
    • http://doxisolawasusig.66ghz.com/form_ng_appeal_to_court_of_appeal.pdf
    • http://apelsins.space/electronics_for_dummies_3rd_edition_download4t8s0.pdf
    • http://xomutukegadoj.mypressonline.com/82130495325.pdf
    • http://devicesprotectionforusers.site/rayon_vs_viscose_bamboo_sheetsn75kb.pdf
    • https://pareniwidof.weebly.com/uploads/1/3/5/3/135313819/pamomibim_fujiwore_vunuwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kesinusaxaduveg.epizy.com/ledewesamuwukogexuwokiku.pdf
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_53375b6454fe4aa5b2850b950cae6eb5.pdf?index=true
    • http://mudotepejix.epizy.com/firth_of_thames_fishing_report_2018.pdf
    • http://vimodamugirad.rf.gd/aquinas_american_school_uniform.pdf
    • http://todidetiped.onlinewebshop.net/ad_til_gotas_bula.pdf
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_c77dc18403a54dbeaf0f0481f0578f68.pdf?index=true
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_0c1d21252af04e7bbb7af1cfd7cfa7f2.pdf?index=true
    • http://gototura.myartsonline.com/unit_impulse_function_laplace_transform.pdf
    • http://fiwemigusa.rf.gd/rawazisusijurosog.pdf
    • http://nexoluximil.rf.gd/los_juegos_del_hambre_cast.pdf
    • https://26aaa629-0581-4e25-ae32-a194504e59ab.filesusr.com/ugd/2d4e87_24373f57a2bf4ce2b2f9d2f3b6029e66.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e707.bin
0b6f078de4478480dac04efbe324a01377645c7d0c445ad61980961c7320efbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 4924 bytes

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