Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb0e52be3af5116…

MALICIOUS

PDF

66.0 KB Created: 2020-11-16 19:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30a2b3ead72e95c8fa6de87083b161ef SHA-1: 1ec401d64065021b7c347ef0293d82b958c642a7 SHA-256: 4eb0e52be3af51161699bedbedb3dcd32c7a836f3b6e56df4e936c95d3aca792
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs that likely lead to phishing sites or further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, suggesting an attempt to manipulate search engine results or distribute malicious content broadly. No scripts were extracted, but the presence of many external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?utm_term=tissue+select+cusa
    • https://kogamawuxeg.weebly.com/uploads/1/3/4/5/134581879/8311455.pdf
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/mibuwazugaxiwom-zapupawuve-fonusixodo.pdf
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/ccc19.pdf
    • https://zozufawagizawag.weebly.com/uploads/1/3/4/4/134454621/e75729744.pdf
    • https://tajekuludukomas.weebly.com/uploads/1/3/4/4/134498487/4339692.pdf
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/7700327.pdf
    • https://niginijepajenok.weebly.com/uploads/1/3/4/5/134505752/6300290.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e6516e14-1de9-4918-8957-07306e4b7003/59454173791.pdf
    • https://uploads.strikinglycdn.com/files/46a887cf-f5aa-4b11-941a-61cf1db4ac94/godimilikimewesaziketof.pdf
    • https://s3.amazonaws.com/tadovu/55872499068.pdf
    • https://uploads.strikinglycdn.com/files/d012eaad-6b77-44ee-96c2-0d15a95d0da8/code_of_ethics_for_coca-cola_company.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ce.bin
4f7dafb1fa5f136f2d0ff1ce3c2c04ead03539dbeb12262461441ae352a575cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CE 4648 bytes
font_01_sfnt_off0000d6a9.bin
6be42005c125c35caff3bae0b12e6ed2dfa2f16163c2873e5f851d9d7a72e515		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 10920 bytes

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