Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbceaabcd8aee10…

MALICIOUS

PDF

78.0 KB Created: 2021-03-23 14:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 390af00ad51e28d8dfd175918133e19e SHA-1: d7bea8eb7570a0830c92dc30d69f4c9d99353066 SHA-256: 5cbceaabcd8aee102c9048783b2a6c93b78f91212c7e3a2d9fe4ea45f9859d18
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to medical information. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=cancer+cervicouterino+signos+y+sintomas+pdf
    • https://cdn.sqhk.co/bajilevone/ibR71ef/96299694203.pdf
    • https://cdn-cms.f-static.net/uploads/4475734/normal_602d24fc3345d.pdf
    • https://cdn.sqhk.co/fuzomorikat/V1hgi7o/llc_operating_agreement_template_word_doc.pdf
    • https://cdn-cms.f-static.net/uploads/4448733/normal_6040371f7fb15.pdf
    • http://cleaner360.shop/will_arris_surfboard_work_with_spectrum0t7o4.pdf
    • http://tersq.fun/bajufozusizudixuginov6ifp.pdf
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5ffa35151a11e.pdf
    • https://static.s123-cdn-static.com/uploads/4369630/normal_60049eae6d333.pdf
    • https://static.s123-cdn-static.com/uploads/4423137/normal_6002c3af416c0.pdf
    • http://korecos.ru/usmc_pack_instruction_cardi8nlz.pdf
    • https://static.s123-cdn-static.com/uploads/4387036/normal_5ff4d0b044252.pdf
    • https://cdn-cms.f-static.net/uploads/4365634/normal_601f9948e7bab.pdf
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5ffbcac5a6e93.pdf
    • https://cdn-cms.f-static.net/uploads/4383698/normal_60187f5b0e132.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/toniseligiwuzux/28236243467.pdf
    • http://butowurakogoz.rf.gd/busser_job_description.pdf
    • https://s3.amazonaws.com/kosipefojaw/1964_alabama_literacy_test_answers.pdf
    • http://kajusob.epizy.com/average_salary_of_geotechnical_engineer_in_australia.pdf
    • https://s3.amazonaws.com/bopuxosavubare/agenda_docente_2018_para_imprimir_gratis.pdf
    • https://s3.amazonaws.com/rewepalazamiso/how_to_connect_my_brother_hl-l2360dw_printer_to_wifi.pdf
    • https://s3.amazonaws.com/vawoginele/barcode_in_excel_sheet.pdf
    • http://delupujak.epizy.com/97339114198.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://medlineplus.gov/spanish/cervicalcancer.html
    • 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_off0000f0ff.bin
27829dabc7046d8f48dd0df71443b00e0b587e433d50065400faf8757ef9b660
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 5512 bytes
font_01_sfnt_off000103b6.bin
05642bd7a67c45c0599496c2cb5e54b6df1cc82e06ae354df2cf82a682daea91
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 11372 bytes