Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be5b1d90c559270…

MALICIOUS

PDF

59.1 KB Created: 2020-11-27 19:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5d8fdcc83c384ac22c2a0e554465611d SHA-1: 4370c53e111ca661d39f515dda4502c32e23eaa2 SHA-256: 4be5b1d90c55927048fe507e789da38b9b3aa641dea79bddda4c7cbdec172260
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-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://traffking.ru/strik?utm_term=dark+souls+what+to+do+with+rite+of+kindling PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408321/normal_5fbed01befb6d.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/teburuvunefudu.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/f71a1c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458852/normal_5faa1d582d62f.pdfIn PDF document text
    • https://nuzuloluxeguvox.weebly.com/uploads/1/3/4/8/134874948/f5e99122.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/1bde5f92-0d1b-4733-abe6-dae692fea30b/51007901689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a88c393-5c10-4bd1-bb8d-25e8972de40d/24930791007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4f5f8e-8dbf-40d2-a84e-80b544df05ee/59366464200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89f6767-3b74-4016-9c75-7149e3776b38/how_to_change_your_name_in_roblox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c281b0-5119-4d0c-81a4-01942b05baed/30259119078.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_off0000ab8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB8C 5324 bytes
SHA-256: cb8d6daa777fb6e3effc1d2ee802f76063a9089ddfa8624efbf5f32fee8b3c9c
font_01_sfnt_off0000bdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBF 10048 bytes
SHA-256: 3ed88f7d48fda354c5c8b1c34c13fb45f6f669633887f0e39c90c387c376d596