Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cee7634eccacb74…

MALICIOUS

PDF

77.7 KB Created: 2021-05-25 16:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 426b2d59c9eac1c56a2fa931c84d2e02 SHA-1: 69e310fa3b8ef73edee82a3a82d7167fc6afdc76 SHA-256: 9cee7634eccacb74a3f02a1dfac6b1ca31f0c07bb32aa3030e3c9c94c14dfa28
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URL 'https://kuzutuzo.ru/strik?utm_term=what+is+the+measurement+of+the+badminton+court+for+singles' is the primary indicator of the lure used.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=what+is+the+measurement+of+the+badminton+court+for+singles PDF link annotation
    • https://jumuwaxenu.weebly.com/uploads/1/3/1/4/131406560/rexorutedubas.pdfIn PDF document text
    • https://wulelosen.weebly.com/uploads/1/3/5/9/135992808/4867992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fe787d59e89f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475197/normal_60096c7498035.pdfIn PDF document text
    • https://sebumeganajili.weebly.com/uploads/1/3/0/8/130874272/180bbd2dbe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_5fd9f42685024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_60447065e7ce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6043fa87b573f.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/3469319.pdfIn PDF document text
    • https://xefomivor.weebly.com/uploads/1/3/0/8/130814633/d9a5c41.pdfIn PDF document text
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/2437455.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/suluromifif-deronaboxoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_5fe93202f163c.pdfIn PDF document text
    • https://boserizozililo.weebly.com/uploads/1/3/2/6/132682878/naturobom-bututizaka-tutasiben-revadino.pdfIn PDF document text
    • https://josudirojupa.weebly.com/uploads/1/3/4/7/134729494/1019721.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387703/normal_5ffce00954a8f.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/bulozor/10122359738.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/tetevulumixofofebofa.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/20062450622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8269f0f2-89b6-443e-8ead-5a242cef7304/39294758827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672fa064-c0f0-4b88-8e58-acd87ac73ccd/girl_short_story_setting.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_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 5588 bytes
SHA-256: 74b5fa8c05c9c22a3e867885e72668bb5bf859ab412ec2e3ec74b85366eabc46
font_01_sfnt_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 10736 bytes
SHA-256: 2fa9eb977508821a332592555d127938b197c672959fee91d88916d0a96e35f7