Malicious PDF — malware analysis report

Static analysis result for SHA-256 2370f33ddf8b6098…

MALICIOUS

PDF

66.3 KB Created: 2020-12-26 02:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8b8ad170447e1bc2569a50c48dc1cbec SHA-1: d9579e1aec072a8c9d2b1e976599e03406c4e6c1 SHA-256: 2370f33ddf8b6098270dac564ec8e2cccde75118fec7da5dd85f4ae45981318b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is cctraff.ru, which is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=okcupid+promo+code+a+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_5fb36938b321a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fbcf52781d8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f91af43e3e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_5fbbd93586813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_5fd67774b004b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5fb4cd2f20180.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/zebapesuluboxaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5fb73c5090e83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5fa8bf1929a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f87105de04b4.pdfIn PDF document text
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/3485c4bd.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/0f81bfd1-19e1-43ec-97ec-dcd9c030ea38/words_with_art_in_them.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_off0000c661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC661 5308 bytes
SHA-256: e69e40f638faa755f414a93132c41628bffa3baef80a896bd52e2e587876fd3f
font_01_sfnt_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 10676 bytes
SHA-256: 2c528315819cdcfa27f60b98ffa9e8d4d18d12daacb4852a44bfa9aecfee0b11

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