Malicious PDF — malware analysis report

Static analysis result for SHA-256 4143a414e056ff87…

MALICIOUS

PDF

77.9 KB Created: 2021-06-11 21:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 198c08a8b3a5371513d7b4ddd7bbaecf SHA-1: b8f448cb5f2aa5ffa77eed6aad3a00d3a00f98a6 SHA-256: 4143a414e056ff872f85db7a6e803597de4390e028fe92cdae39501afb6629cd
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. The document body, though partially corrupted, suggests a lure related to an 'injury report', which is likely a pretext to drive users to the external URL 'https://leonvi.ru/123?utm_term=injury+report+nfl+patriots'. This URL is the primary indicator of compromise, likely serving as a phishing page or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=injury+report+nfl+patriots PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491148/normal_6031d310708d7.pdfIn PDF document text
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/498634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fe90b07ccc76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_606017eb141aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5fddde73e9acc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393900/normal_60346d88f288d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457312/normal_604564dbcf1f8.pdfIn PDF document text
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/zetik-dowofum.pdfIn PDF document text
    • https://nuwurabe.weebly.com/uploads/1/3/4/4/134477198/3b0b66c.pdfIn PDF document text
    • https://guzorinimalagaw.weebly.com/uploads/1/3/1/3/131381991/kegojo.pdfIn PDF document text
    • https://lijemokuw.weebly.com/uploads/1/3/4/8/134853622/5178846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_603f79450b789.pdfIn PDF document text
    • https://xiluruzubu.weebly.com/uploads/1/3/0/8/130813732/2b7af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372707/normal_5fcf440adcdde.pdfIn PDF document text
    • https://dunewalowipeli.weebly.com/uploads/1/3/1/8/131856746/806843.pdfIn PDF document text
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/kekem.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4489716/normal_60b563549158e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_60c14790beb5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupatamim.pbworks.com/f/yeto_vellipoyindi_manasu_watch.pdfIn PDF document text
    • http://barotidi.pbworks.com/f/best_app_for_ringtones_for_iphone_8.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/what_is_the_income_limit_for_medicaid_in_la.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/w/file/fetch/144709746/dowibategefaxijimuvujuwi.pdfIn PDF document text
    • http://biduzoku.pbworks.com/w/file/fetch/144569463/37624167179.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/how_to_file_a_cease_and_desist_letter.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/where_to_take_cars_for_simeon_gta_online.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_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 5012 bytes
SHA-256: 91508b7068621655fee77bbf55c26c65786a969dbff1d21c715b77b17bea82ef
font_01_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 11700 bytes
SHA-256: 4c9c0835515280a7fd1bd7de01703c141b618907422c16a9f63cd4daae9e8170