Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb189a7f2f8ba28…

MALICIOUS

PDF

86.5 KB Created: 2021-01-30 05:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 76028987d2306a4ff6dbf297b22cbbf8 SHA-1: 70b06d5e74786894cbfc59674039bb0acb829451 SHA-256: 5fb189a7f2f8ba28d2b99a6c4ca95289188c445480dac1554b4dda321a92d7e7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, particularly one pointing to 'jacksth.ru', suggests the document is designed to redirect users to potentially harmful websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure malicious links within a large number of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/123?utm_term=best+healing+spells+pathfinder PDF link annotation
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/4947186.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5fefeb82f0d05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc5b594510aa.pdfIn PDF document text
    • http://rugozuravonabib.22web.org/single_bed_sheet_cotton_online.pdfIn PDF document text
    • http://jelabenix.22web.org/muxajavobugupox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464311/normal_6002093033942.pdfIn PDF document text
    • https://sinekamawo.weebly.com/uploads/1/3/0/7/130776883/190525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407784/normal_5fe1955387fde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tutasujal/ranuvazozomabiwenagux.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/cash_flow_statement_solved_problems.pdfIn PDF document text
    • http://mogadaf.epizy.com/email_signature_template_adobe.pdfIn PDF document text
    • http://xedonufil.rf.gd/89253091052.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/lirodilezalew.pdfIn PDF document text
    • http://rufofexejojar.epizy.com/beaded_collar_necklace_template.pdfIn PDF document text
    • http://xumizaxojumiko.epizy.com/metformin_benefits_for_skin.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/16506288325.pdfIn PDF document text
    • http://rimalapotozuf.epizy.com/melurubefixewimalegez.pdfIn PDF document text
    • http://rafetomobu.rf.gd/54881187326.pdfIn PDF document text
    • http://gazonenewotife.epizy.com/12481564362.pdfIn PDF document text
    • http://numowun.rf.gd/7131353136.pdfIn PDF document text
    • http://jugixumob.rf.gd/ashke_amrinder_gill_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/gadewosivevogaroludin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 5032 bytes
SHA-256: 948e1f896d6490aca00aa61220dd8cd9525f15e048c90ee8ddc01352461d448b
font_01_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 11072 bytes
SHA-256: cdc5ec31df96654bbfe4ea2cee154362fe85aa24076f49f766c739734c7aa285
font_02_sfnt_off00013e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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