Malicious PDF — malware analysis report

Static analysis result for SHA-256 342875d522fc2f37…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 18:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4348d45a282cb1f22c7049be4db2367c SHA-1: 539eb6fd9c0ac59000f0a350b6b5625c26711543 SHA-256: 342875d522fc2f3798ede966e6e85279bba1596a0e4b62f8d21578829192ba72
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to redirect users to external sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=grade+3+spelling+worksheets+canada PDF link annotation
    • https://binemipo.weebly.com/uploads/1/3/0/8/130874238/tusigoworudes.pdfIn PDF document text
    • http://alteramaks.world/coherence_and_cohesion_worksheetsdis41.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/ja3hhic/15261415942.pdfIn PDF document text
    • http://p-kavkaza.ru/aluminium_sheet_metal_bunningsfwg8y.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/recetas_de_cocina_para_el_ayuno_de_daniel.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/english_conversation_book_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jegisizozul/fE3gejj/apprendre__lire_l_arabe_rapidement.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/24144470191ody6r.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/turip/43944910340.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/how_to_replace_panasonic_microwave_bulb.pdfIn PDF document text
    • http://girofili.myartsonline.com/what_habitat_does_a_white_tiger_live_in.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/nisajegigubafebix.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/sexubu.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/94498589220.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/free_construction_cost_estimate_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/af_guideline_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/best_football_games_for_android_2018_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/22453183514.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_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 5688 bytes
SHA-256: 98b3ca0aa76f6220ee85fb05c1c902740858f5420ed6a9fd3e6e0bccf021d13a
font_01_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 10776 bytes
SHA-256: 68033709e397f5ed33455d25ba30c4bb4f2e3361a32b9ace113b7de97273552a

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