Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5ce60878b74323…

MALICIOUS

PDF

76.6 KB Created: 2021-03-10 19:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6f5fafcd686ea7950d59713dc98c3792 SHA-1: 8a0776edf96c714abcf3dd70968504125567ec8d SHA-256: 2c5ce60878b74323c5682038e3a4949b24ad3ab0bf3e6d700d99243ccb290e47
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 pointing to PDF files, suggesting a link farm or SEO spam campaign. The primary URL, https://vilenefex.ru/strik?utm_term=irobot+860+vs+675, is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=irobot+860+vs+675 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fc58458d3259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460457/normal_5feb4671e5321.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/9720387.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476429/normal_6002b0eca6183.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496580/normal_6005a07166942.pdfIn PDF document text
    • http://teenagetutor.online/xiximoteziruzanabenumuspjw4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_60330e2600857.pdfIn PDF document text
    • http://vikubemaba.22web.org/12357529221.pdfIn PDF document text
    • http://dashcamtopbest.com/how_much_does_a_2020_honda_rebel_500_costxgx4l.pdfIn PDF document text
    • https://kuxodebareku.weebly.com/uploads/1/3/4/0/134042390/gokidabibexedipokomu.pdfIn PDF document text
    • https://suridivulav.weebly.com/uploads/1/3/5/3/135312357/d6d05a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369640/normal_5febd86e654e6.pdfIn PDF document text
    • https://rozozejowetape.weebly.com/uploads/1/3/4/5/134510424/45e43cccd76b.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/5c7e980d-9a6a-4f28-9477-8418770b9604/bhagavad_gita_quotes_in_telugu.pdfIn PDF document text
    • http://bumufemukelogik.epizy.com/antalyaspor_formas_2018.pdfIn PDF document text
    • http://zifasodokid.epizy.com/dajunodel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0df958f-0a6d-4cd8-b853-1a3ac3f64197/25426963640.pdfIn PDF document text
    • http://rozofamano.epizy.com/student_profile_page_template_bootstrap.pdfIn PDF document text
    • http://purevaxa.epizy.com/adjective_clause_and_phrase_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf999b0-d753-43b5-8057-e3d0e1d2c7ce/myron_mixon_rib_bbq_sauce.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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 5268 bytes
SHA-256: e1682b147be404622a6bd084efd2ab5746947ed9277b8b37f06a5c777e81887e
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 10956 bytes
SHA-256: e7e67583873d916505240681a87b31a7fe7e1c26968d6477289e5e05e72186ad

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