Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6e7d3ebd01364d…

MALICIOUS

PDF

77.7 KB Created: 2021-06-07 21:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5a5fd5c02bd8c0e10185e70bedd9824 SHA-1: d99b070125313de167a6a7c786a0266fd79cd58c SHA-256: 1f6e7d3ebd01364d863fb306ac3778199a8be138e80ba599fe92f7b48e077454
194 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. It uses an invoice-themed lure. 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 0.9999

Heuristics 7

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://garglob.ru/pbw?utm_term=how+to+make+authorization+letter+to+claim+documents PDF link annotation
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/1749547.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/8fc5e4570a8.pdfIn PDF document text
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/fd228c1d6.pdfIn PDF document text
    • https://xoravali.weebly.com/uploads/1/3/0/7/130775395/bosikidixozoxig.pdfIn PDF document text
    • https://jelakuge.weebly.com/uploads/1/3/1/8/131856802/wiruko.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/tuzukamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/fuxijasoxidekabevo.pdfIn PDF document text
    • http://kunozulig.pbworks.com/f/bepukoviravozukigovopufo.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/f/descargar_mods_para_street_legal_racing_redline.pdfIn PDF document text
    • http://gezibilivun.pbworks.com/w/file/fetch/144805146/nikka_zaildar_3_movie_songs_download_mp3.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144532371/do_i_need_to_rinse_carpet_after_using_rug_doctor.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144445182/how_to_get_unlimited_coins_in_subway_surfers.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144748950/bose_wave_music_system_2_manual.pdfIn PDF document text
    • http://gufikugefisu.pbworks.com/f/27717597084.pdfIn PDF document text
    • http://xewubamefa.pbworks.com/w/file/fetch/144679068/polemilibilebedekibu.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144527967/hypotenuse_leg_theorem_worksheet_answers.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/f/gobuxasir.pdfIn PDF document text
    • http://zivovot.pbworks.com/w/file/fetch/144644097/lapomupipitewovulusufi.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_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 5344 bytes
SHA-256: 9a9a670160422b3a839916ab70b5c5f2e893cda776cc698fe021c0c52bde0c2b
font_01_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 10680 bytes
SHA-256: e5b7c623c8431b6c17f7da898f17d19f1ee3fa39600ee87fce16b867aa2130b7