Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a09bf8504e86749…

MALICIOUS

PDF

59.6 KB Created: 2020-11-18 20:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1aa3993862669009520515461f705e9a SHA-1: 24af61eb4b561241156f057c2fd954324d0855ef SHA-256: 6a09bf8504e867492e2ed3ce1765985e1f6fe5b844289a4d33f7cc737dc63d9f
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 0.9996

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://trafficel.ru/strik?utm_term=professor+messer+220-+902+course+notes PDF link annotation
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/puxigewapit-semeziguxo-tijimevile-lopafobodize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8ef6d07e676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f88ef087943f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_5fb3e0e3b19cd.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8276696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5f8fdc02b4061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_5fb41d2bf091d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5fa3daa9154de.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/a72a4811-2055-4ad3-bbd4-1e31804af700/cell_division_and_mitosis_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/gukujibumaxepibojejewer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0641315b-fc44-4893-8b9c-bd8a70ed4ad9/kilokaguk.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_off0000ad5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5D 5248 bytes
SHA-256: 00477a3249174633bdaaf2f1e8f3d73c93362159fa232383b249fc3010b78c25
font_01_sfnt_off0000bf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF29 10372 bytes
SHA-256: 84537c5d600815b5f985ec627644f756543bcb50e900ca094b6f640ccdc11216