Malicious PDF — malware analysis report

Static analysis result for SHA-256 f882e619e1dfcbd8…

MALICIOUS

PDF

77.2 KB Created: 2021-06-02 09:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f94b9da30ab6f4e49347aab714372777 SHA-1: c418f5183fbd4a9ca80b29958221775018cfe35d SHA-256: f882e619e1dfcbd84e84f9ee0e3569a5ac7ef30431cafa48f8c55bc44d3ecd61
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document employs social engineering tactics, presenting a fake CAPTCHA and a lure to install a browser extension or update. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware or divulging credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://laborke.ru/pbw?utm_term=bypass+frp+lock+samsung+j2+prime PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478133/normal_5ffcde5fa8f2a.pdfIn PDF document text
    • https://jogijomovap.weebly.com/uploads/1/3/0/9/130969693/9099817.pdfIn PDF document text
    • https://tuloforukidape.weebly.com/uploads/1/3/4/7/134752744/4449323.pdfIn PDF document text
    • https://muduzefob.weebly.com/uploads/1/3/4/0/134018051/tirosovawemif.pdfIn PDF document text
    • https://tipezigixak.weebly.com/uploads/1/3/4/3/134339593/wutaruzipimivif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_6033a60ac8278.pdfIn PDF document text
    • https://jomijumad.weebly.com/uploads/1/3/0/9/130970003/narevofigawob_gagoxonuwog_bipasefituba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456369/normal_603be065e7663.pdfIn PDF document text
    • https://mujolopiwajini.weebly.com/uploads/1/3/4/3/134379833/sazevunu_daxivuxirag_jasusi.pdfIn PDF document text
    • https://xatikofaf.weebly.com/uploads/1/3/0/8/130814669/5291518.pdfIn PDF document text
    • https://nuzepobijane.weebly.com/uploads/1/3/4/8/134885792/7143760.pdfIn PDF document text
    • https://venireza.weebly.com/uploads/1/3/5/9/135959939/wuberodap.pdfIn PDF document text
    • https://vokajaxu.weebly.com/uploads/1/3/7/5/137511102/2374662.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df190d8-26ce-48ce-8117-b2935f5312b2/90109882056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a90fefe-6005-4752-b24f-26ff038a932b/xokofozewejesukotirigebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406fb4e2-9d03-4fea-bf55-d997df8ecbb5/vonadifuzodew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0734b3db-ba48-4f4e-a71b-b0e5320e00ad/how_to_study_for_new_2021_pmp_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4148f1-2305-4951-b9de-437e49a8da54/28561864411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c71c1c8-fa9c-40a2-9285-d12ceb9ed87e/28419478767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cde6eb6-5d26-4078-9451-cf3a801c755e/xogokidixugowudifiporeni.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_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 5756 bytes
SHA-256: 79de8016b16928674c8865267728939354186cb9ec28aba251563e6bfda3d84e
font_01_sfnt_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 11960 bytes
SHA-256: 6ae9de132d9a61fa9fb2699773dfd1860fc1003b0fd72902c5903711f899d54c

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