Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bdf441a36d2d6f…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 20:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dd6b3dca2eaef43fbd5bbee8cde53b7d SHA-1: 71e60d7be08db0552bbfd73b7191b6b82366dfe4 SHA-256: c8bdf441a36d2d6fdd81df389ff47661bc3613d8b77374c7f1ab6e5985351223
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=prayers+that+rout+demons+read+online+free PDF link annotation
    • http://zahlungsservice-ch.site/hpi_savage_x_4.6_spur_gearia9tl.pdfIn PDF document text
    • https://gavizixuf.weebly.com/uploads/1/3/5/3/135334805/4199718.pdfIn PDF document text
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/kobebujewi_wuwojuzi_wolugegevobe_wugawezo.pdfIn PDF document text
    • http://m-laskin.ru/summer_waves_elite_frame_pool_reviewsw1fqr.pdfIn PDF document text
    • http://by-roof.ru/weather_report_standerton_mpumalangaosux6.pdfIn PDF document text
    • https://diloxutal.weebly.com/uploads/1/3/4/5/134598378/9183165.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/latufenaw/zapevutasadupafavuviv.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/pexabibalisofamavupit.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/password_reset_disk_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/cryptic_crossword_puzzles_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/what_is_law_in_malaysia.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_b0272c636236488698e15cb45bde24ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/rotufidolijilisuxen.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/hollywood_movie_websites.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/format_to_string_javascript.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_327f6da77a1548d188e7c17116022390.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mipizaju/effective_communication_competency_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/b_tech_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/26845708615.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_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 5248 bytes
SHA-256: be158cca354f5833242a2541b9af0adce4e09294ef7e39ca4a3204f645064886
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 10452 bytes
SHA-256: c3483f6debc3833f90c9850fa231dada0ff5315115fa1ea63a5aec525860c7ca

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