Malicious PDF — malware analysis report

Static analysis result for SHA-256 537f8b281e51cf21…

MALICIOUS

PDF

62.7 KB Created: 2021-03-31 11:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31e35d808b0714bd640d709ecbdf4754 SHA-1: ab9f2dbee5f339c4820c2893f6eb591f40710074 SHA-256: 537f8b281e51cf21aecbac98a86a28f3a26a2a51f4f39be591c434dda3dd807f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://pelibifir.ru/award?keyword=search+pdf+text+in+a+folder'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9614

Heuristics 4

  • 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
  • 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/award?keyword=search+pdf+text+in+a+folder
    • https://cdn-cms.f-static.net/uploads/4371004/normal_60460e4dcc490.pdf
    • https://cdn-cms.f-static.net/uploads/4375095/normal_603b4b117b4b4.pdf
    • https://cdn-cms.f-static.net/uploads/4379601/normal_603f618a81efe.pdf
    • https://valowitezud.weebly.com/uploads/1/3/5/9/135993777/vemizam.pdf
    • https://cdn-cms.f-static.net/uploads/4402717/normal_600d3282877dd.pdf
    • https://cdn-cms.f-static.net/uploads/4478125/normal_601b49337dd07.pdf
    • https://static.s123-cdn-static.com/uploads/4369149/normal_5fe3dac55c047.pdf
    • https://kemigaguni.weebly.com/uploads/1/3/1/0/131070112/ba482a5e.pdf
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/358672.pdf
    • https://s3.amazonaws.com/kotenu/55675772641.pdf
    • http://pogitijerilux.epizy.com/best_workout_plan_without_weights.pdf
    • http://judogife.rf.gd/english_sentences_with_tamil_meaning_download.pdf
    • https://s3.amazonaws.com/wefadep/biochemistry_practical_book_mbbs_download.pdf
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_0ae819de2d094f7ab348100e4c001a48.pdf?index=true
    • https://s3.amazonaws.com/jusagi/30497618216.pdf
    • http://dapolejalufimi.rf.gd/75525457309.pdf
    • https://s3.amazonaws.com/resabomibogodaw/2015_buick_lacrosse_service_manual.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/broan_allure_36_range_hood_filters.pdf
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_b149584f207b4470a9d60a857ccf4772.pdf?index=true
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_74bc1675fd434fd9a4b029be38d430f2.pdf?index=true

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