Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac0d35d4565a041…

MALICIOUS

PDF

76.5 KB Created: 2021-02-20 07:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d8f482a1d19072ceb7f6b583f67a269e SHA-1: f4341a14cc07c5a1ff5e14a5728accaaa492a8d9 SHA-256: 1ac0d35d4565a0414815f0bc0695153ccf64e1f2910e7e6a390e07aaede6e95e
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware installation. The ML classifier strongly indicates maliciousness, and the presence of numerous external URLs, some on disposable hosting, further supports this. No scripts were extracted, but the overall pattern suggests an attempt to trick the user into executing further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://baarspo.ru/123?utm_term=an+acres+of+diamonds+lyrics+and+chords PDF link annotation
    • http://sapofogagesari.iblogger.org/78004914025.pdfIn PDF document text
    • https://cdn.sqhk.co/ritafase/U3DI7hg/steam_download_mac_among_us.pdfIn PDF document text
    • http://xuduxuv.iblogger.org/cheek_cell_dna_extraction_lab_question_answers.pdfIn PDF document text
    • http://extrameets.fun/38700524187lde7l.pdfIn PDF document text
    • http://dezunanerab.iblogger.org/google_email_setup_on_android.pdfIn PDF document text
    • http://fruit-ital.space/59298886524w5g2.pdfIn PDF document text
    • http://cethq.xyz/advanced_scientific_calculatoro47b7.pdfIn PDF document text
    • http://nogefiri.iblogger.org/fipap.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/j3NMze8/smart_tv_50_inch_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kabasefojegozaf.epizy.com/k_g_f_chapter_2_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/website_template_maker.pdfIn PDF document text
    • http://kimirukuku.epizy.com/tajolabavalofukaju.pdfIn PDF document text
    • http://xuwuxubemepimox.rf.gd/aha_guidelines_pediatric_pulmonary_hypertension.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/36603357301.pdfIn PDF document text
    • http://xupanapil.epizy.com/social_psychology_theories.pdfIn PDF document text
    • http://tamazodatitemi.epizy.com/semunupurigedenegate.pdfIn PDF document text
    • http://siboxep.epizy.com/10760157702.pdfIn PDF document text
    • http://norilonabu.epizy.com/spotify_premium_free_windows_7.pdfIn PDF document text
    • http://xoxitazowakovit.rf.gd/medical_microbiology_bacteriology.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_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 5352 bytes
SHA-256: eb6143178adc8fb0f871fd89bf4e767fd024fbeca0c6b63744ac1019817331e7
font_01_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 11756 bytes
SHA-256: 63d5a867356ef4c775a6a152c4c37844a3f22981a6d966a4671622a3bac9073a

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