Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bdc7bb4584e887…

MALICIOUS

PDF

66.1 KB Created: 2020-11-19 21:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8c38d4e78772f7c4eb7180276078a4c8 SHA-1: ebb13590863c5448d1d3271b371a748f45daa350 SHA-256: 24bdc7bb4584e887753b190e961e70412d0eafca5c0be6c5304b7d4b7acedd4c
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various URLs. One of these URLs, https://traffine.ru/123?utm_term=helen+ross+mcnabb+center+inc+maryville+tn, is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm for SEO manipulation.

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
  • 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://traffine.ru/123?utm_term=helen+ross+mcnabb+center+inc+maryville+tn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5f9c7e38643d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f8bab1ae6e44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5fa63e9681924.pdfIn PDF document text
    • https://juboxunogaruf.weebly.com/uploads/1/3/4/7/134700559/tizixozeriz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5fb5c9524d3ae.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/94c6c0c8-6883-4e3c-8c57-aec0a95c8e20/free_poulan_pro_chainsaw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/astrology_houses.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/lunomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a284822-690a-48fa-8cbd-512f935f541c/bigonivodejumoxuvawage.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/proyecto_energia_eolica.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/blue_lick_elementary_school_address.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_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 5208 bytes
SHA-256: ebf0a685637c39ceb903816d53d6e28333291aaf3754a2d6341eb476ae3a1f3d
font_01_sfnt_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 11808 bytes
SHA-256: f1b330e279e059b0d2aba2367c4a16ca07713566b52464f7787fd436490b1cca