Malicious PDF — malware analysis report

Static analysis result for SHA-256 b504441a8c8c9180…

MALICIOUS

PDF

77.5 KB Created: 2021-02-28 04:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 58c0fd86c3e636d2c6790ca05a2b6576 SHA-1: edd6626a545a456aa5fb5b290c40d72a2ec7392f SHA-256: b504441a8c8c9180fe828f45327e1649abadce76f8039e375a243854b4b3ec51
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 are hosted on suspicious domains and lead to other PDF files, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document designed to redirect users to harmful content.

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://seumenha.ru/strik?utm_term=how+to+use+the+keurig+reusable+k+cup PDF link annotation
    • http://powerhdniy.space/kiwatuzikekudemefudimidekv020s.pdfIn PDF document text
    • http://goodik.fun/how_to_get_a_helicopter_in_gta_5_cheatnsbdu.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/8jadlhh/47977735379.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/jcheGib/zawotupoz.pdfIn PDF document text
    • http://chatik85939775.fun/homiltica_esboo_de_pregao5zlbd.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/4200263.pdfIn PDF document text
    • https://vuzipelafow.weebly.com/uploads/1/3/4/6/134688966/9264475.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/sagotomagin/best_beat_maker_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/netgear_extender_manual_ex6100.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/biology_corner_diffusion_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/glencoe_mcgraw_hill_new_york_geometry_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/retojujifudafemudope.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/mac_os_iso_64_bit_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/long-_staple_egyptian_cotton_sheet_set.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_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 5452 bytes
SHA-256: 47e940e527c940035059aed8ef1df5f9817a7dfdc07f59234c297a08451614c3
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 11784 bytes
SHA-256: bf55dbabe817a6c3b7595f7f8a46bb538c291a8752a86272d1b9f5e00a03c335

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