Malicious PDF — malware analysis report

Static analysis result for SHA-256 2093abaa2a45e559…

MALICIOUS

PDF

74.4 KB Created: 2021-02-25 06:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b799af7493c2c5e4ca88dfe1a8b131c5 SHA-1: db9af93b1a2649922a2a9b8588100b22fc51149d SHA-256: 2093abaa2a45e55987b71670aeec66368cf529bc6f2258b5c3f57b781b003f94
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 appear to be SEO-optimized or part of a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. ClamAV detection and ML classification strongly indicate this PDF is malicious, likely a phishing or malware distribution tool. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attack pattern focused on deceptive link aggregation.

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://baarspo.ru/strik?utm_term=introduction+mathematical+analysis+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486742/normal_5fc9e7b641523.pdfIn PDF document text
    • http://abanca-electronica.com/cartes_du_ciel_linuxri83m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489586/normal_5fffc0a19076b.pdfIn PDF document text
    • http://usene.xyz/dalekuxakbzuj3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446015/normal_5fd97661d6561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_6035ea5a64602.pdfIn PDF document text
    • http://instapriz365.site/best_4k_55_inch_tv_under_5005p1wh.pdfIn PDF document text
    • http://wiinorama.fun/introduction_to_real_analysis_textbooknutvu.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/469909.pdfIn PDF document text
    • https://mixodozom.weebly.com/uploads/1/3/4/3/134333910/vowiver.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5fe18d37c7432.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446633/normal_60052a1c2b0a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5fe82f0681ae3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5ff77b98476d7.pdfIn PDF document text
    • http://vas-rem.ru/xupepepabezinossvl.pdfIn PDF document text
    • http://itclick.info/frequency_table_statistics_definitionccwzc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 5432 bytes
SHA-256: 9cc684997cef27cd78133c16663d032e8c888f353c8c31bc984273d1667a3e6c
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 10752 bytes
SHA-256: 326d7149c93c9c554d96d3b8e6e49b3718b595c8bc85b1777d42b89665153b18

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