Malicious PDF — malware analysis report

Static analysis result for SHA-256 8936ee6dbf2af142…

MALICIOUS

PDF

78.4 KB Created: 2021-04-24 14:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6976af7bd98594f26e305a0dfecf7fed SHA-1: 2500901dbc696c308a79b509fa8d1947bb1c945f SHA-256: 8936ee6dbf2af142a17c9b53f2afcbf2e3a997ed0753f48eeb1766b973f12333
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, references 'Kali linux basics course for cyber security', likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=kali+linux+basics+course+for+cyber+security PDF link annotation
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/kadozedevepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_606e8feec73f5.pdfIn PDF document text
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/volenitin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_601c73cbe166e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_601d6bf4ad98e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5fef813cee77a.pdfIn PDF document text
    • http://mishgen.com/91633283743vatuk.pdfIn PDF document text
    • http://waxenotesanil.22web.org/caffe2_android_github.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5fd842abd52b4.pdfIn PDF document text
    • https://piberarejini.weebly.com/uploads/1/3/5/3/135332679/bixosupamoroba.pdfIn PDF document text
    • http://nickned.me/26674893330mlm.pdfIn PDF document text
    • https://mepurukog.weebly.com/uploads/1/3/5/3/135306658/5216705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_60445eb29b02b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481397/normal_5ff413dc430bf.pdfIn PDF document text
    • http://naturaitalia.space/kung_fu_panda_2008_wikipedias2xmi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_602761d6451e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_60292b18f18b5.pdfIn PDF document text
    • http://devgm.design/twilight_free_online_movie_no_downloadj2a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408170/normal_5fdc19dda078f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dezajok/juvetewosizufepodeneb.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/harbor_breeze_merrimack_remote_programming.pdfIn PDF document text
    • http://konapawejiwevin.epizy.com/free_postnuptial_agreement_form.pdfIn PDF document text
    • http://fizaveloxuraje.rf.gd/87283474422.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/box_top_education_submission_forms.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 5152 bytes
SHA-256: 8c22701bb8a7df5c4f7b35c66a6186d23df59bb93aeb34ef49c3d2412bfd8b43
font_01_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 10952 bytes
SHA-256: b072b663acc7c20e765a9e67d88930280f68292cfe7f77d84956f2c193455f9e