Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86a331c2b2418a0…

MALICIOUS

PDF

79.3 KB Created: 2021-05-23 19:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 03433654404a596af366a3de7389e29c SHA-1: 5bba7ba47c83eaf22a48b3a9508cef7b80d88fd3 SHA-256: e86a331c2b2418a0800b0a103f0c8e5756075f0658ebddbb79595b488aa20570
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=administrador+de+archivos+premium+apk', are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=administrador+de+archivos+premium+apk PDF link annotation
    • https://gonokuxugun.weebly.com/uploads/1/3/1/6/131637302/4a0bfdde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454184/normal_60084df7386a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_604ff310ae5f0.pdfIn PDF document text
    • https://moraraxewurazi.weebly.com/uploads/1/3/4/0/134042425/ropulebanolewa-poxibizita-gupujar-dafika.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_60644deb2744d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_603d70f6ca0a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483864/normal_60018dd0c227e.pdfIn PDF document text
    • https://minikugonon.weebly.com/uploads/1/3/4/5/134500064/dbc782d7d307515.pdfIn PDF document text
    • https://bemisawu.weebly.com/uploads/1/3/4/7/134716701/9939902.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/zonobexowolomimubor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_600dbb3342c80.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/zezin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446762/normal_5ffe7e1e70801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_605c628b9448a.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/9413797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444630/normal_5ffc04a892787.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/teximikamukubo/53676272020.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/why_is_my_macarons_not_drying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c4b7e9c-3f2e-48ee-89dd-d27c0f33c75a/48407493201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f399a4fe-f456-422f-824c-15eb1e30cbbc/vita_spa_control_board.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/rabulageb.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_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 5396 bytes
SHA-256: 507be9dce928c7051c244fa54f13de30ea5976a354b432d62984b371a70533cd
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 11792 bytes
SHA-256: 5e92270bb1e7eca64bd5dc59c2640848317bd9c1e32a5f47afa85496a587a908