Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe34c72472944ca5…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 18:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f390d10b6cf5fe45adc9453602e50aec SHA-1: c7b16a9ecee260d0a0b1feecd5f4ac68a6d821b9 SHA-256: fe34c72472944ca5024e1b536fc0de7a84b77321f364e3f1edfb5e4645b227c8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document body and extracted URLs suggest a lure related to driver downloads, with the primary malicious URL being 'https://mezovuduw.ru/strik?utm_term=toshiba+satellite+l750+drivers+for+windows+10+64+bit'. The PDF also contains multiple links to disposable hosting, characteristic of a link farm used to obscure malicious destinations.

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://mezovuduw.ru/strik?utm_term=toshiba+satellite+l750+drivers+for+windows+10+64+bit
    • http://hotloveme.online/80824966886qc2n0.pdf
    • http://fogimikolasot.iblogger.org/kulorajerisigox.pdf
    • http://vivadoctor.ru/jozapauf7qv.pdf
    • http://pinipuvazus.22web.org/arjun_movie_video_songs_free.pdf
    • http://pegodetopado.iblogger.org/perokavo.pdf
    • http://kunozoxutokusu.mygamesonline.org/kusode.pdf
    • http://omerkatanalp.com/hp_z420_z620_z820_windows_10_x64_driver_packwrz8b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kuboki/chimp_report_uganda_news_today.pdf
    • https://s3.amazonaws.com/xenavuxa/vaste_song_mp4_pagalworld.pdf
    • https://s3.amazonaws.com/tinezedu/kuwoxuviwowejofonisatu.pdf
    • http://xeladijigaw.epizy.com/epson_xp_820_ink_cartridge.pdf
    • http://wuzonovow.rf.gd/igora_royal_color_chart_2018.pdf
    • https://s3.amazonaws.com/watajive/active_passive_transport_worksheet.pdf
    • http://zevusup.atwebpages.com/strongs_bible_kjv.pdf
    • http://fodusazal.rf.gd/is_news_break_app_safe.pdf
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_91a1b927c4e642ff92cc5055df3f3a60.pdf?index=true
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_11c430227a0343d69a3f1c0626ae6485.pdf?index=true
    • http://xilavivugup.epizy.com/clinical_orthopaedics_and_related_research_author_guidelines.pdf
    • http://bawujirilo.epizy.com/chandramukhi_video_songs_free_-_telugu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc93.bin
a28241bce3f36909c31b6020ceb53814781b287877c7bb8f56c5e08572e54598
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 5664 bytes
font_01_sfnt_off0000efe8.bin
7c859e575d61f72c1a6bcfe7f4a640866a7210c7d9269621ccec7631daac83c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 10932 bytes
font_02_sfnt_off000114fb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 4324 bytes