Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0979b1771cd0ba…

MALICIOUS

PDF

77.8 KB Created: 2021-05-15 12:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 099b205baea79648fe198a689f7a3ad7 SHA-1: 5262cabec7608a058b0454b622e6433447e16c3d SHA-256: cf0979b1771cd0ba945bf7422a817b56ff965b973da830355c601493a857f657
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=what+are+some+examples+of+career+objectives PDF link annotation
    • http://dudipoviju.22web.org/31008289366.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/hjWwlid/fiji_airways_a350_seat_map.pdfIn PDF document text
    • https://nesilinazum.weebly.com/uploads/1/3/4/8/134886609/guzij-faziveduk.pdfIn PDF document text
    • http://nuzikukobusan.iblogger.org/td_jakes_books_on_marriage.pdfIn PDF document text
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/36ef66b309a.pdfIn PDF document text
    • https://cdn.sqhk.co/tajugajobib/bhcWKib/59489408060.pdfIn PDF document text
    • https://xuzojawuwakobo.weebly.com/uploads/1/3/4/3/134312069/ddba9ea.pdfIn PDF document text
    • https://gijepunudadolow.weebly.com/uploads/1/3/4/4/134497403/bivoxak-verow.pdfIn PDF document text
    • https://nobametu.weebly.com/uploads/1/3/2/7/132740930/rewoxilepezijageva.pdfIn PDF document text
    • https://vufikodimaduxi.weebly.com/uploads/1/3/1/0/131070035/sivefoviziborenisaz.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/eiijm2I/mine_manager_jobs_south_africa.pdfIn PDF document text
    • https://lejawoxaniw.weebly.com/uploads/1/3/0/7/130738778/1026047.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxunoromi/gdiczig/chori_chori_film_song.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/483b3853-a200-4e2e-be03-5b00b98f9884/wakugipazukedisisubadogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f38a10-8acc-4f3e-baa2-64070e81c7bc/xutomexudum.pdfIn PDF document text
    • http://larojoxejatu.epizy.com/28685535308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14e6184-747a-43b3-8792-e37dc7a9400e/what_were_major_events_in_the_renaissance.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/arcsoft_totalmedia_3._5_serial_key.pdfIn PDF document text
    • http://xabuduzefaf.epizy.com/mefegubuzor.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/zarixewusidagorobiwi.pdfIn PDF document text
    • http://meganajaxovitag.rf.gd/84282560822.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/devexpress_report_parameter_date_format.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/65019470803.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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 5612 bytes
SHA-256: 14f48eaeeef40bfd24071a0d907448568c6e97e7be8857e7c7ec0741ec9942a3
font_01_sfnt_off00010040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 11420 bytes
SHA-256: 6e6f3390931db39549323eb0ba242d889c17de05921f28e15a34621dddd6d39c