Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3df64a736cbdd02…

MALICIOUS

PDF

74.4 KB Created: 2021-02-27 06:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 497d250c34e3a6714efeb55f07a42d7f SHA-1: a707fbc953d5cc2f8dd79b5115be5f83e8627093 SHA-256: b3df64a736cbdd02a49006ef316f73a85885fe578d907fb6c99530d4c278782f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The presence of embedded URLs and the overall structure strongly suggest this PDF is designed to redirect users to malicious sites or download further payloads.

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 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://leonvi.ru/123?utm_term=how+to+start+an+online+business+uk PDF link annotation
    • https://cdn.sqhk.co/tuwagezo/hc59wjh/weather_app_icon_purple.pdfIn PDF document text
    • https://xovonugobo.weebly.com/uploads/1/3/4/6/134688771/10c3c9b68ba2f5.pdfIn PDF document text
    • https://nepuvaduwixoki.weebly.com/uploads/1/3/4/5/134525355/332839.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/cKPjjia/14160394804.pdfIn PDF document text
    • http://memisada.mygamesonline.org/morrowind_prophecies.pdfIn PDF document text
    • http://fisifur.iblogger.org/esl_comparatives_worksheet.pdfIn PDF document text
    • http://migajipanijezep.22web.org/38609161501.pdfIn PDF document text
    • https://wijinopupog.weebly.com/uploads/1/3/5/3/135323990/loteruporof.pdfIn PDF document text
    • http://zekinaperobivak.22web.org/19173374942.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/h2hhfQ5/8480010704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/salem_witch_trials_documentary_history_channel_worksheet.pdfIn PDF document text
    • http://povuputuk.epizy.com/yamla_pagla_deewana_all_video.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/how_to_program_comcast_remote_to_tcl_tv.pdfIn PDF document text
    • http://nawexox.epizy.com/87961648361.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_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 4936 bytes
SHA-256: b26cca4005d58d1b0f9774cf54e09320fbe491ec6e69cb7aa8b8ecf618b7fc4b
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 10452 bytes
SHA-256: 690eb242c4db8cac44269c6468d509af296cbe9b513caeddee7d37404f2fc169

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