Malicious PDF — malware analysis report

Static analysis result for SHA-256 f331c3a75f01084d…

MALICIOUS

PDF

87.2 KB Created: 2021-06-05 02:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdf520355eed25fbbc764215c399398b SHA-1: a0465853a1483343044983764702b15532769aea SHA-256: f331c3a75f01084dced33afbb27a0a332d45fbe37fcf3ce21bef049cf5d6c782
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URL pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/pbw?utm_term=mortal+kombat+trilogy+move+list+pc
    • https://cdn-cms.f-static.net/uploads/4484365/normal_60192dee191c4.pdf
    • https://static.s123-cdn-static.com/uploads/4408586/normal_5fee022ac9513.pdf
    • https://cdn-cms.f-static.net/uploads/4475737/normal_60562b09b6e8a.pdf
    • https://cdn-cms.f-static.net/uploads/4500669/normal_602cdfa82a404.pdf
    • https://static.s123-cdn-static.com/uploads/4461777/normal_5fcbbbbc3d7af.pdf
    • https://cdn-cms.f-static.net/uploads/4383137/normal_5fe984746373d.pdf
    • https://static.s123-cdn-static.com/uploads/4415525/normal_600167fc10f8f.pdf
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fd66518d018c.pdf
    • https://static.s123-cdn-static.com/uploads/4371543/normal_5fe59cd441cf2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f7a9d363-f278-4bed-b8b5-a8c76de5b37c/resumen_completo_de_un_mundo_feliz_por_capitulos.pdf
    • https://uploads.strikinglycdn.com/files/600faf6b-3cd2-4735-ace0-5a84eb79e1ad/45095197270.pdf
    • https://uploads.strikinglycdn.com/files/2f551e28-3800-40b3-8f70-c16b2b5e02f3/3882739707.pdf
    • https://uploads.strikinglycdn.com/files/2329b4ab-fb0d-4dbc-91ea-21fc2a9ad0fc/64975070885.pdf
    • http://kivotin.pbworks.com/f/ccna_tamil_tutorial_free_download.pdf
    • https://uploads.strikinglycdn.com/files/a6842a86-5b5e-468a-995b-1c9640070e92/jokigixeketizaz.pdf
    • http://foziwedugumu.pbworks.com/f/98667816584.pdf
    • http://felinemumivu.pbworks.com/w/file/fetch/144527919/tema_sul_bullismo_e_cyberbullismo.pdf
    • https://uploads.strikinglycdn.com/files/d259229b-16d0-441c-8dcb-6065d3b8b0e3/waduxu.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_off00011452.bin
9433a12b7748934f8369b4a6dd69e32c546425e3dfb09f58efaae2cbf86e37cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 5624 bytes
font_01_sfnt_off00012779.bin
622a45bcdaf799562b09477e0ae7b12978f9f559431a15b57a525d0ba5492b65
pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 12300 bytes