Malicious PDF — malware analysis report

Static analysis result for SHA-256 41645d2e86be1700…

MALICIOUS

PDF

79.4 KB Created: 2021-03-03 09:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21672bed1c7349c558f66852487f6b43 SHA-1: 7ad015c7697d389e098151b73d519dfcb72f5a85 SHA-256: 41645d2e86be1700878f9c972c7c8d6e4515d8bf4d95b394f241bb925e06b43e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/123?utm_term=piano+music+bookshelf
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5fded5c73e645.pdf
    • http://kogiwonewaveg.iblogger.org/xofolanuz.pdf
    • https://cdn-cms.f-static.net/uploads/4370317/normal_602ce058363b8.pdf
    • https://cdn-cms.f-static.net/uploads/4490128/normal_6011dc0c41155.pdf
    • https://cdn-cms.f-static.net/uploads/4369317/normal_600f59fd59740.pdf
    • http://dikebar.22web.org/lexirilexinajisaw.pdf
    • https://static.s123-cdn-static.com/uploads/4411501/normal_5fccc49215162.pdf
    • http://kurekarer.22web.org/setoleta.pdf
    • https://cdn-cms.f-static.net/uploads/4381976/normal_6034392386810.pdf
    • https://static.s123-cdn-static.com/uploads/4374715/normal_5fdd5f5ddbaf9.pdf
    • https://nalafefig.weebly.com/uploads/1/3/1/3/131379301/6576255.pdf
    • http://jakusavu.sportsontheweb.net/badland_2500_winch_remote_bypass.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fozajekipijijax.epizy.com/investigacion_cualitativa_y_cuantitativa_en_psicologia.pdf
    • http://tevufojetuxovud.rf.gd/fomisatunatitituwiwububoj.pdf
    • http://karifopiti.epizy.com/afsar_full_movie_filmywap.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_off0000fa3c.bin
f9b77da1d18347e24b1b83e5ed6b70365a154be60d8553e0e53a62f030d85cda
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 5228 bytes
font_01_sfnt_off00010bec.bin
093d0f570a2a8afeb314682f5270d7577f98dc91e072a29ccd6c6566829f3fc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 10864 bytes