Malicious PDF — malware analysis report

Static analysis result for SHA-256 994dfbcb9237f042…

MALICIOUS

PDF

82.1 KB Created: 2021-04-05 10:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cd32e56cbd6aeb23c7b646a1fba8e85 SHA-1: d228eeb257e58e8f5acce063e9a39cbb9175a622 SHA-256: 994dfbcb9237f042493d6b47f71801d7245a2dffdba97b0c15d3827b4e21f971
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An embedded URI points to a suspicious domain, 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'investing online for beginners', suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/strik?utm_term=investing+online+for+beginners
    • http://bubble1.space/playerunknown_s_battlegrounds_license_key._txt_freexu4dj.pdf
    • http://kavademive.sportsontheweb.net/libros_de_ortopedia_pediatrica.pdf
    • https://cdn-cms.f-static.net/uploads/4456399/normal_601fe1e4aeb3e.pdf
    • https://static.s123-cdn-static.com/uploads/4375700/normal_5ff07a8e4df0c.pdf
    • https://nulumekut.weebly.com/uploads/1/3/4/3/134373747/kigevazu_banuxorifoma.pdf
    • http://gibelepij.scienceontheweb.net/activity_based_costing_sap.pdf
    • https://static.s123-cdn-static.com/uploads/4473062/normal_600985062c532.pdf
    • https://cdn-cms.f-static.net/uploads/4406501/normal_600a631a3aef0.pdf
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/78948.pdf
    • http://verifedform.com/technical_chart_analysis_bookf381l.pdf
    • http://meblik.su/browning_auto_5_friction_ring_setupet32b.pdf
    • http://texno3ua.com/sikodedo4qqq1.pdf
    • http://xiruzox.mygamesonline.org/61173238047.pdf
    • https://cdn-cms.f-static.net/uploads/4448346/normal_60277b614ba73.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7a783805-f0fd-46d0-bb26-49cc77220cc2/marques_de_sade_pelicula_online.pdf
    • https://uploads.strikinglycdn.com/files/6ebb39c6-9242-4a9e-ada8-def1a8fd5fc7/lennox_pulse_21_furnace_filter.pdf
    • https://uploads.strikinglycdn.com/files/c8d42b1d-2392-40ae-b118-4bb64180cfef/vuxajedipunelupafu.pdf
    • https://s3.amazonaws.com/luworizesupox/46004648624.pdf
    • https://s3.amazonaws.com/nunakixuma/maytag_quiet_series_200_dryer.pdf
    • https://uploads.strikinglycdn.com/files/18e022c8-449e-4821-9a6d-675a809375c0/79872974990.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_off00010482.bin
ab3acf223a23de246c0e6aecaeebc4963e53045b5d6b689d503ba662c840b746
pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 4860 bytes
font_01_sfnt_off0001152a.bin
be3dcc688307b325a5d4881bb1a66aca2c81e2be8b5362ee70a399568311290f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 11064 bytes