Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84a0d13fba98fbf…

MALICIOUS

PDF

84.5 KB Created: 2021-03-10 06:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 732ce1e2ff46bc9d7c10e0736e32e1de SHA-1: e2e6314a3caf0382ff50dbca82929499143e4aee SHA-256: c84a0d13fba98fbf3782ffb422f82f2021b5bc4ae27beaa4cc8041ca54338f01
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that leads to a suspicious domain, identified by heuristics as a potential phishing or malicious lure. ML and ClamAV classifiers strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'space figures and cross sections practice'. No scripts were extracted, but the presence of an external URI points to a likely attempt to redirect the user to a malicious site.

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://bologen.ru/wix?keyword=space+figures+and+cross+sections+practice
    • https://static.s123-cdn-static.com/uploads/4369909/normal_6007d16d76817.pdf
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5fe3e97d17888.pdf
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/wepimul.pdf
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/893900.pdf
    • https://cdn-cms.f-static.net/uploads/4369664/normal_602872805144a.pdf
    • https://cdn-cms.f-static.net/uploads/4447640/normal_604817b6038be.pdf
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5ff47addb5387.pdf
    • https://cdn.sqhk.co/mowanideju/bxihlGB/3574880263.pdf
    • https://cdn.sqhk.co/kewukapugino/hilCAjA/pop_slots_free_chips_instagram.pdf
    • https://cdn.sqhk.co/konanetufuda/jjvhaeP/black_christmas_2006.pdf
    • https://static.s123-cdn-static.com/uploads/4474222/normal_5fed4b2bec25c.pdf
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/dakon_gonodaxigeluti_desexem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_7209b136e3b447aba57cd82ca4438bac.pdf?index=true
    • https://s3.amazonaws.com/zabevog/mythical_creatures_word_search_pro_answers.pdf
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_786ae9c7d1cc4c118e7288faef50e787.pdf?index=true
    • https://s3.amazonaws.com/kegubinefuda/50825517904.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_off00010d6a.bin
98b8014cff485b0e23cd299c3fa9fe3fe5438f330085f0d9c8915451e4b55d16
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 5396 bytes
font_01_sfnt_off00011fd3.bin
323b49345b40c8ab5c00e3eac9171304a9709292c19f66a7efe88ea9a894893e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 10896 bytes