Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52739f46ce16b95…

MALICIOUS

PDF

60.2 KB Created: 2020-11-10 07:03:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a64ad5d48687ffe6b6ab8ea22dddbab8 SHA-1: 9353a228008e131ebc21f5829c6a28b5332a9862 SHA-256: e52739f46ce16b95fbb0d1a0f02a941165389f068ae49222dca6c6aca4929414
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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?keyword=racor+filter+2020n-30 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f93e909656cf.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/kulutoxoruxel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5fa9bf324647b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5fa6f2278a6db.pdfIn PDF document text
    • https://tijaworiluwulu.weebly.com/uploads/1/3/4/3/134363233/zorigamemep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5f9cab982b2e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f9449e9b0057.pdfIn PDF document text
    • https://lifagixuwemup.weebly.com/uploads/1/3/0/9/130969738/69933d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5fa5d0c63b0e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8faadf13af0.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/4d2e2d15-f6c2-476c-8409-75f085162251/86504935391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddcedfa-7330-4927-8166-bd9e3d23e045/lowrance_elite-5_manual_download.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_off0000af5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5F 5172 bytes
SHA-256: b6e3ed5784a5042d24aab1fae0b13af0ac6ad97c9838a253d0c5eb097b1811ca
font_01_sfnt_off0000c117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 10372 bytes
SHA-256: 3fe7c3e380769253d698f1df727411ed04a9ff7b94808ca751b4d9abfd8f453b

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