Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b58b04e47dc3f4e…

MALICIOUS

PDF

79.4 KB Created: 2021-04-07 21:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a9e9bf388a8f973eadce9aad5dee6041 SHA-1: 055609633b90aea0b6f2bc65c7a2ed8637275a61 SHA-256: 5b58b04e47dc3f4ee4d0694350f80611e2a9bcf39d7eb5973890109be6542f2b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://bologen.ru/strik?utm_term=health+economics+by+bhattacharya+hyde+and+tu+pdf PDF link annotation
    • http://vobosivadujilep.22web.org/big_ideas_math_geometry_student_journal_answer_key.pdfIn PDF document text
    • http://tolebexeju.22web.org/75929706632.pdfIn PDF document text
    • http://guxesux.22web.org/90063294689.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/96099102e89.pdfIn PDF document text
    • https://zegijavevezedoj.weebly.com/uploads/1/3/4/3/134309525/pekem.pdfIn PDF document text
    • http://bovozewoxif.22web.org/list_of_positive_adjectives.pdfIn PDF document text
    • http://nojosomefoviw.66ghz.com/sort_by_alphabetical_order_google_sheets.pdfIn PDF document text
    • http://fosufupivufup.66ghz.com/temigefuvifuxemifajela.pdfIn PDF document text
    • https://nizowidupisex.weebly.com/uploads/1/3/4/5/134502208/bc5cd70049830c1.pdfIn PDF document text
    • http://filokozi.iblogger.org/93392144258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepikinol.epizy.com/dynamatic_technologies_limited_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/samsung_j400f_frp_unlock_file.pdfIn PDF document text
    • http://xefivaz.epizy.com/56238572406.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/dcs_su-25t_vikhr.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/28913252581.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/8161971593.pdfIn PDF document text
    • http://bobupugarini.epizy.com/sekiro_drunkard_boss_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/tupoxezu.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/dosokezexetawusogak.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/nupasozizinenebafebuvose.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/gimisorufugar.pdfIn PDF document text
    • http://jatujij.rf.gd/xezexakofagif.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/19439324627.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/brookfield_viscometer_procedure.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/nike_air_force_1_custom_paint.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_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 5600 bytes
SHA-256: 80a17c1688070ed1cb4b8090d0ee3e60a4a3ebda8feeed8cb5da0bf739e98265
font_01_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 11364 bytes
SHA-256: b6bedbbaccf57d2d872e598bb488878f0ccc797e54b683bfda5bfa06e83c450d

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