Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63b5fce857067b4…

MALICIOUS

PDF

86.5 KB Created: 2021-03-04 09:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: a65c2d5c7644f39ca3bdcff08fdee0f2 SHA-1: 5b51e0241750f249d312d834ed1a25bc78a4ad51 SHA-256: b63b5fce857067b43e1b8368e7131e3e139749b6710b19ed8dca8c0bdb97093d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'Ace personal trainer exam answers', intended to trick users into visiting the linked malicious sites. The presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=ace+personal+trainer+exam+answers PDF link annotation
    • http://zabolojisag.getenjoyment.net/92055942389.pdfIn PDF document text
    • http://alcozerox.com/a_pocket_guide_to_public_speaking_5th_edition_freekcchc.pdfIn PDF document text
    • http://silvanozito.online/18854604898nhcf0.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/MjjOjf0/police_siren_ringtone_mp3_download_pagalworld.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/rancilio_silvia_upgrade_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/LigiiGS/jekojoxifenolunivezeve.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/jewonokesixajebaxavi.pdfIn PDF document text
    • http://osummer.space/906485964859farp.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/vGgf0jc/ronubefog.pdfIn PDF document text
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/29cb7105.pdfIn PDF document text
    • https://sazezikamujut.weebly.com/uploads/1/3/1/4/131438312/gutukuju.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/savuvi-vakixiloz-timare.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/fowodakavepeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusebirenox.myartsonline.com/prefix_and_suffixes_exercises.pdfIn PDF document text
    • http://dinorafox.epizy.com/94867228530.pdfIn PDF document text
    • http://bomafedugu.epizy.com/viper_479v_remote_start_programming.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_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 5228 bytes
SHA-256: 4d53f6bde9d584fc77d1c02355da83128d48f2b59cb3afdc0eeba649edaf5f7e
font_01_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 11228 bytes
SHA-256: 47f6779d2ec12762186f80468b5b4bc1c5aba25405bd050fb409c0638a81a017

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