Malicious PDF — malware analysis report

Static analysis result for SHA-256 4515a4b87536cad3…

MALICIOUS

PDF

57.2 KB Created: 2020-12-23 00:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 295563ae68edd633ac83366432978847 SHA-1: cd11e93a6acaf4e5c21eb3d5a5087306437a37f7 SHA-256: 4515a4b87536cad38de8f64de560053b4d5e64355a874ea17cd972ad79fab094
154 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 are SEO-optimized PDFs, suggesting a link farm designed to attract traffic or distribute malicious content. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or scam campaign, likely using JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8225

Heuristics 4

  • 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
  • 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://trafficel.ru/wb?keyword=centurylink%20online%20payment PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f87ba6b48e15.pdfIn PDF document text
    • https://rugazodexozapef.weebly.com/uploads/1/3/4/4/134480570/semojowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481397/normal_5fcc0b49b5328.pdfIn PDF document text
    • https://sovokuragul.weebly.com/uploads/1/3/2/8/132814371/9afaa08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5f98ca7ec7893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5f9366303e815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_5fd7711b7c78c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fcf005bd3abc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449615/normal_5fdd926db978f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_5fa8a08af145b.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/pazovugal/kereladinixowo.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/interpersonal_skills_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/acronis_true_image_home_2017.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50E 4860 bytes
SHA-256: a9af8d7277ed012bea74f665c43c551c47f89ed9b3c27a037b03353ba2e98112

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