Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c51794a32773e48…

MALICIOUS

PDF

60.7 KB Created: 2020-11-20 13:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3c6e16bc0624738a1b0e86aec1c307d7 SHA-1: 2ec3b31b15250616f85d9bec32c8adc784ce5164 SHA-256: 8c51794a32773e48cf7e44a29e2f3179c216ad30b6eef76cf953672fbe54f5c4
156 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffnew.ru/strik?utm_term=the+juice+box+bully PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f877f0de26fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_5fb300f8f1f2e.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/rozolobedivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5f8e198ff39af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_5fb37e77d2891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5fa69f6a986e1.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/000b0574-3ff6-43b7-86f5-accf9c945265/fawasaxulewevidawiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a7a69b-da47-4d70-a302-4d002af6f512/it_s_even_worse_than_it_was.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f13dd1-2983-4e07-93a0-d67395f70820/sabiberununaboki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bacc225-8b75-4bad-bd07-d10004471a29/ruporo.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_off0000b5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E6 4736 bytes
SHA-256: 6ab5334e468cdd0d796b17e9811b98fd34d0f190bd22d2333d2f0b9871fbbfa1
font_01_sfnt_off0000c614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 9488 bytes
SHA-256: dbf4c938a6c0714001acf41394ed87ad5e7893a50f9da0f90fd345f088f7a8c8