Malicious PDF — malware analysis report

Static analysis result for SHA-256 b256e8ab5c497c72…

MALICIOUS

PDF

86.5 KB Created: 2021-05-09 18:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb5d1f585c983ccc55ff44bc46372541 SHA-1: 6e8954a2fba55a09655de34c864d4705f17fa984 SHA-256: b256e8ab5c497c728bc6c7afe19650a84ac52c85a21a8550bb063d51910c4e65
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that directs users to a phishing page disguised as information about furnace problems. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the document is designed to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://baarspo.ru/strik?utm_term=bryant+plus+90i+furnace+problems
    • http://lagulesuko.medianewsonline.com/evangelismo_dinamico_luisa_walker.pdf
    • http://rostov-mobile-doctor.ru/first_strike_roscoe_paintball_revolver_cal._50fqqrj.pdf
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fdb61e9758bd.pdf
    • https://wovadipe.weebly.com/uploads/1/3/4/4/134462462/gedexobeje.pdf
    • http://bcipreactivaperu.com/futaba_18sz_priceudx6l.pdf
    • https://static.s123-cdn-static.com/uploads/4426955/normal_5ffba3ccf3d59.pdf
    • http://tigadugutuvatix.mygamesonline.org/33410467286.pdf
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/9360976.pdf
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/9864080.pdf
    • http://raisinshub.pro/2160935572ufdsh.pdf
    • https://sofifego.weebly.com/uploads/1/3/4/8/134899758/noxarizajo_neruzabusiku_laganabulagigu_zeboxaxilepem.pdf
    • http://good-production16.site/finebaxejuwonoso1l17x.pdf
    • http://catsism.com/javabesokowef8zhv2.pdf
    • https://static.s123-cdn-static.com/uploads/4501775/normal_5fdf0e3d1d17e.pdf
    • http://xunopapazugatar.medianewsonline.com/como_sacar_la_molaridad_de_una_solucion_acuosa.pdf
    • https://cdn-cms.f-static.net/uploads/4366402/normal_60461c75ee2a9.pdf
    • http://bigmagazin.xyz/65514861705be1sm.pdf
    • http://sesalon.xyz/fojapuroxiptxcnj.pdf
    • http://zzzmmmmejjj.space/toxipizajumodatolipoxu66f6a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://legokejapo.atwebpages.com/the_lesson_toni_bambara.pdf
    • https://uploads.strikinglycdn.com/files/3fa0725a-e231-4ce0-aaa4-f94289b8c35c/how_do_i_calibrate_my_acurite_humidity_monitor.pdf
    • http://bototiluwoge.atwebpages.com/ionization_of_weak_acids_and_bases.pdf
    • https://uploads.strikinglycdn.com/files/3776f9ac-caeb-419c-b527-b3a887874350/wirulorafofedijaxusiz.pdf
    • https://uploads.strikinglycdn.com/files/d602c0f8-2716-4908-a4d6-6b2e21057f80/how_to_write_a_proof_for_congruent_triangles.pdf
    • https://uploads.strikinglycdn.com/files/ce7afd17-f067-4fae-a607-fd40c08f0a40/machine_learning_definition_stanford.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_off00011295.bin
c86a7ce6ec7e17dd5fa21049ca3d3ce0667d9d01a34b78e0820ab8e1ee140e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 5752 bytes
font_01_sfnt_off0001260f.bin
17b56a2aefd5a0d1819e2cb373c8e0066aaac833ede34d040786cb6284b84bb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1260F 10672 bytes

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