Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b92af346eeb4ca…

MALICIOUS

PDF

61.3 KB Created: 2021-02-25 01:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 75d0df68982815e08fe9f14ff7c55a39 SHA-1: f61000d727fd39cf9fd3a12c38aab5119754199a SHA-256: c8b92af346eeb4ca11d93058b3ae4082826016f4a9e0e5d63cbeedac4112c29a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('baarspo.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting a malicious intent. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6759

Heuristics 4

  • 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
  • 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=starbucks+cold+cups PDF link annotation
    • http://xuvaxujogilo.mygamesonline.org/96630513637.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/cJghigG/the_survival_hunter_games_2_apk_mod.pdfIn PDF document text
    • http://hocostyle.ru/which_moment_corresponds_to_the_maximum_potential_energy_of_the_system_view_available_hints9boe6.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/idhgKpP/dexegepuxuzibogufiwasox.pdfIn PDF document text
    • http://uablog.site/wojenogozirawavidofoza9g4cp.pdfIn PDF document text
    • http://instup.xyz/beowulf_new_translation_barnes_and_noble52pzx.pdfIn PDF document text
    • https://cdn.sqhk.co/zobunifi/c7Uyugg/forgot_my_boost_phone_number.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/87790552774.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/31398722441.pdfIn PDF document text
    • http://tekoboworitutew.epizy.com/elapsed_time_worksheets_grade_2.pdfIn PDF document text
    • http://zerakunutage.epizy.com/xafinodisid.pdfIn PDF document text
    • http://gevalej.epizy.com/brick_breaker_mod_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/blockheads_mod_apk_latest.pdfIn PDF document text
    • http://gerekuvuburase.epizy.com/kikomolalojemaralavexi.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/35821530688.pdfIn PDF document text

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