Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1428bf6bc67f96e…

MALICIOUS

PDF

77.8 KB Created: 2021-05-18 03:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c14fef618d6bb5ba8ae501af5fd30de SHA-1: c3166b6e19f6a318ace41004bb3df6cc81dfbbed SHA-256: c1428bf6bc67f96eb0cb0f6494e256d02936be3c3e2e8eee93c25d3bffa7b01f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains an embedded URL and a heuristic firing for a download button, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm its malicious nature. The primary IOC is the external URI pointing to a potential payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/strik?utm_term=pokemon+emerald+omega+zip+file+download
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/sarisare.pdf
    • https://static.s123-cdn-static.com/uploads/4404529/normal_60065b1892ff4.pdf
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/3109881.pdf
    • https://cdn-cms.f-static.net/uploads/4472774/normal_6039fcd2e1d9f.pdf
    • https://static.s123-cdn-static.com/uploads/4503050/normal_5ff4c3497d165.pdf
    • https://static.s123-cdn-static.com/uploads/4499629/normal_5fc72a1beeac4.pdf
    • https://vamugibamapiju.weebly.com/uploads/1/3/4/5/134588186/5132291.pdf
    • https://ribekafov.weebly.com/uploads/1/3/4/7/134761657/nobexome.pdf
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5ff24ed834438.pdf
    • https://rufufuwoka.weebly.com/uploads/1/3/1/4/131454634/3473530.pdf
    • https://mukaperu.weebly.com/uploads/1/3/4/6/134649449/4346414.pdf
    • https://cdn-cms.f-static.net/uploads/4388824/normal_6017d017d473c.pdf
    • https://cdn-cms.f-static.net/uploads/4403937/normal_6059842dd5f35.pdf
    • https://static.s123-cdn-static.com/uploads/4456998/normal_5ffe84b71ce2b.pdf
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/panolipagamotu-divur-detigakagajese.pdf
    • https://cdn-cms.f-static.net/uploads/4490523/normal_601b9aac237ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bf5b8fc3-10a1-4e26-9f36-4287cf8804cd/sentry_safe_key_not_opening.pdf
    • https://uploads.strikinglycdn.com/files/60e921f7-a2ae-4c0a-a7a6-4e319722c196/mikomolivivutelo.pdf
    • http://jifaxonajipe.rf.gd/calculus_and_its_applications_12th_edition_free.pdf
    • https://uploads.strikinglycdn.com/files/319903eb-c90e-4e88-9286-5d86ad3a8864/solving_applied_mathematical_problems_with_matlab.pdf
    • https://uploads.strikinglycdn.com/files/62c0fbb9-e737-4268-a890-d68407a68361/how_to_change_filters_on_kinetico_k5.pdf
    • http://nejotuwusa.rf.gd/converting_to_word_doc_for_free.pdf
    • https://uploads.strikinglycdn.com/files/b1c59781-c067-4a12-a5f3-bbeced10e5a0/kezuw.pdf
    • http://vezapuro.rf.gd/brotherhood_whatsapp_status.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef05.bin
27c53b36fbbeeb7dc166ef7dc91dc93d87cc22712e4c8b40dbbc693c27c5d151		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 5388 bytes
font_01_sfnt_off00010166.bin
82209d9b25f57a93815b197626619e51dff454137858914eae7a4909fdf26de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 11680 bytes

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