Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61b309be34a17ec…

MALICIOUS

PDF

75.1 KB Created: 2021-03-18 23:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab8e31c6b331b987bf423f097451b28f SHA-1: 828a6b4a27ed94f35a93b21026bdd1ac3697ec36 SHA-256: c61b309be34a17ecc4dda3470053e5ae9982452866342108ebf34240e117d1a3
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to the suspicious domain 'jumiwimov.ru'. While the document body is heavily obfuscated, the presence of the external URI and the malware detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=wu+tang+clan+name+generator+reddit
    • http://zutatowatipo.mywebcommunity.org/78568947206.pdf
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5feafee1ba632.pdf
    • https://static.s123-cdn-static.com/uploads/4421061/normal_6003b9c0b0d90.pdf
    • https://cdn-cms.f-static.net/uploads/4384482/normal_604bc1aea5ad8.pdf
    • http://wefigofozotime.22web.org/count_zeros_in_np_array.pdf
    • https://cdn-cms.f-static.net/uploads/4389809/normal_603eaf2fb34d4.pdf
    • https://cdn-cms.f-static.net/uploads/4459937/normal_6023cde673ca3.pdf
    • http://dufigep.scienceontheweb.net/1982110955.pdf
    • http://sujatafuluwariv.22web.org/davuvazafa.pdf
    • http://gufurebu.medianewsonline.com/zowilujam.pdf
    • https://cdn-cms.f-static.net/uploads/4483354/normal_6041aff9dd0bb.pdf
    • https://cdn-cms.f-static.net/uploads/4376362/normal_600d420d9683c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://baxajuzurajuj.rf.gd/formule_loi_binomiale_1ere_s.pdf
    • https://uploads.strikinglycdn.com/files/7462e877-71fa-4c61-8988-65ca4048daad/94847917941.pdf
    • https://uploads.strikinglycdn.com/files/70a49a18-13c2-4e4a-8a9d-8f59a9d0495a/tabikowanibijanolo.pdf
    • http://palelezugob.onlinewebshop.net/how_to_pray_salatul_istikhara.pdf
    • https://uploads.strikinglycdn.com/files/bfcb7596-c8e0-4f1d-b902-eaf8f987e5a3/are_dreams_reality_or_imagination.pdf
    • https://s3.amazonaws.com/woneketelak/nutraceutical_industry_project_report.pdf
    • https://s3.amazonaws.com/rurosaveruk/34087404072.pdf
    • https://s3.amazonaws.com/pirofopafu/suwadub.pdf
    • https://uploads.strikinglycdn.com/files/b8facd5f-fe6f-49fc-b779-df7483dcf32e/gesejisexolemagaviduzuri.pdf
    • https://s3.amazonaws.com/nilafafakem/bipimejokivek.pdf
    • https://s3.amazonaws.com/widiku/sports_car_colouring_sheets.pdf
    • https://uploads.strikinglycdn.com/files/e914bb8b-72ce-46e0-91d0-b11c24090e7c/respuestas_del_curso_aprendizajes_clave_primaria.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_off0000e8ec.bin
83feb8ed84bce75cad04a0ca584db796e2e98aae937c7835db3bbbeea447af79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 5092 bytes
font_01_sfnt_off0000fa32.bin
1863e787bcfee9ba34a1c38b76bfceab79039cf439726731ee867c9eda7b2e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 10684 bytes

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