Malicious PDF — malware analysis report

Static analysis result for SHA-256 da144bc05b46f5be…

MALICIOUS

PDF

73.8 KB Created: 2021-02-24 05:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 54666456f7a61b2adf45c5d9a64bbd12 SHA-1: fe5dbdbc1b14a716fbae6d710d638932c7a4009f SHA-256: da144bc05b46f5becc59a07dfe41a3db5027f8b6076e79a822f2347d50f00707
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as Pdf.Phishing.Trojan. The document body, though partially corrupted, suggests a lure related to a holiday in Fortaleza. The embedded URL points to a suspicious domain, likely used to host a malicious payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/123?utm_term=hoje+%25C3%25A9+feriado+de+que+em+fortaleza PDF link annotation
    • http://mibajisokawetu.iblogger.org/figapa.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/jcWiirB/ice_galaxy_live_wallpaper_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/jcP3gYq/oscar_movie_fish_man.pdfIn PDF document text
    • http://lemiritafuwab.22web.org/kubernetes_nginx_ingress_log_format.pdfIn PDF document text
    • https://cdn.sqhk.co/ramejolir/dsnaoWZ/vavukaja.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/jiYiigc/30th_birthday_cake_party_ideas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fozipifi.epizy.com/33189396891.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/how_to_work_a_hamilton_beach_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/2173221103.pdfIn PDF document text
    • http://vozajaw.rf.gd/article_370_in_telugu.pdfIn PDF document text
    • http://surowopewol.epizy.com/wijezifagi.pdfIn PDF document text
    • http://sobuzazan.rf.gd/fiwixide.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/ledurizisorivegapovegafem.pdfIn PDF document text
    • http://kixasudasiwub.epizy.com/nrega_fto_report_2018-_19.pdfIn PDF document text
    • http://zozoramotuwiv.rf.gd/person_who_cant_stop_hiccupping.pdfIn PDF document text
    • http://rexawisoza.epizy.com/curso_de_marketing_digital_online_gratis_2020.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_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 5232 bytes
SHA-256: 0dd140e3cc51c36b900001b7e05a9a6820862ca5dfe8dea4b57328d24e1999a2
font_01_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 12524 bytes
SHA-256: 33aec01d6c3e1e609ddbf2154f02e8f824a9b2da9c8ab32b85c90eb881d80b08

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