Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36744744f78d6d5…

MALICIOUS

PDF

78.0 KB Created: 2021-03-23 23:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50501a74e67dcc7d20132167e0e7415 SHA-1: 69406be45f23682ffc4a20f21de1875c86a2d3e0 SHA-256: c36744744f78d6d58915dbbd64ce7df5f635eba25715a145208bf668109b716c
96 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'https://zajinet.ru/award?keyword=spring+time+yiruma+pdf', which is likely a lure to a malicious site. The document body, though heavily obfuscated, appears to contain metadata related to the URL's keyword, suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=spring+time+yiruma+pdf
    • http://optarfes.com/leche_materna_exclusivavun52.pdf
    • https://cdn-cms.f-static.net/uploads/4393220/normal_605530b9d087c.pdf
    • http://tryici.xyz/how_to_fix_a_phone_that_says_not_registered_on_networkmz935.pdf
    • https://cdn.sqhk.co/gufojakig/vLRgdjg/turamupixarejofi.pdf
    • https://cdn.sqhk.co/safubuguva/ii8xoge/jufuzexaxixitozafifore.pdf
    • http://ideaita.fun/ic_design_engineer_salary_in_singapore28rqq.pdf
    • https://cdn-cms.f-static.net/uploads/4502906/normal_600d79fb9cf2a.pdf
    • https://cdn-cms.f-static.net/uploads/4451929/normal_6049ba4ccb821.pdf
    • https://cdn-cms.f-static.net/uploads/4456387/normal_604da7d66fa6f.pdf
    • https://cdn.sqhk.co/vewukiziwemi/Jjifeha/xadokupuxowetigitez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zobuwubedak/tozenawefa.pdf
    • http://gamukezaf.rf.gd/how_much_does_an_interior_designer_make_yearly.pdf
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_c5b103d02f8643f596e27c609f51cd30.pdf?index=true
    • https://s3.amazonaws.com/fadupazageraf/demonstrative_pronouns_grade_2_worksheet.pdf
    • http://xelatisil.rf.gd/ludogetexojafisib.pdf
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_589c841b19b24dcface76438e1b94cc8.pdf?index=true
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_cf2fa10d2fdc412596f7c419d83f607f.pdf?index=true
    • http://levewome.epizy.com/princess_diaries_volume_10.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df68.bin
6e45e90258894319e88d8c358bbec9d4010ca022603e90ed8d205fa44eb86b12
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 5128 bytes
font_01_sfnt_off0000f0c0.bin
9d9ed773edf4984d440f56d0e1919f2bc1afb545093476b87208f49ced33aae6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 13700 bytes
font_02_sfnt_off00011b7d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 4324 bytes