Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d65a99e91d3d60…

MALICIOUS

PDF

77.5 KB Created: 2021-03-08 04:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 893767a6ae79f4ab8307ebb22cd4f054 SHA-1: 9dfea83f78c229476d0bf32cca266ac506825411 SHA-256: 23d65a99e91d3d60f08a24c2029a77e447ae5e376aa5d3db3a2d2020f445d557
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://botokaw.ru/wix?keyword=flurry+of+blows+5e+effects PDF link annotation
    • https://dubibezu.weebly.com/uploads/1/3/1/4/131453247/japofode-dusijuvazisadi.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/2772971.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/19870566390.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/bawunaba-bijopavulexod.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/Shcpzgf/11414190895.pdfIn PDF document text
    • http://gasolotiravizid.sportsontheweb.net/riruw.pdfIn PDF document text
    • https://gesivakegozuk.weebly.com/uploads/1/3/4/7/134768451/bdd921a350.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/sakujuvigipagogupulo.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/red_pyramid_graphic_novel_read_online.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/el_nombre_del_viento_mp3_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/eAjeBqB/khloe_kardashian_age_16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_d9722c5ac40342ceaf99bbf0bcdfd668.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_8848c40eb9364c22b0f65b4334618bad.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_180b893c14fb4878964ea63785ffcfc1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/duxitogev.pdfIn PDF document text
    • https://5fc21e60-8324-4589-92a2-9ffbe60b24fc.filesusr.com/ugd/3bcfef_ac069149fbaf4620b7ab366d02f9c480.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawuvud/74190790010.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_d0e6809e7e1d4a9b96a3d3786abadb36.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_42106d15d1974fb9885b2845d3ce5b22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/ardisia_compressa.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_7cac9b0581064578860dca0f7a9aca7f.pdf?index=trueIn 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_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 5076 bytes
SHA-256: 29dff16b5301beb15ee2361511d1dd7d4a6cb1ec6931c372f2c951ed8ac46799
font_01_sfnt_off000105c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C3 10148 bytes
SHA-256: c09b30e0e24217bd2137b561a9422d76218923e8607f0e2f23eeb1ad3be4684b