Malicious PDF — malware analysis report

Static analysis result for SHA-256 34651c322ddf8611…

MALICIOUS

PDF

88.3 KB Created: 2021-02-27 18:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 902c3e8e06e5ae3f37055c7ff40190a9 SHA-1: ecedb1fc676afb994768354a8ebd707b842146a2 SHA-256: 34651c322ddf861103d95e3673ed4b9d461c985c744f6b008d728b7a84cc572a
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser extension or update. This, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://golowaki.ru/strik?utm_term=affirming+diversity+the+sociopolitical+context+of+multicultural+education+ebook PDF link annotation
    • http://sigefolaxapuve.22web.org/nutajisolojizozaxegawe.pdfIn PDF document text
    • http://trackcreditscore.info/69760278211zy9ce.pdfIn PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/aed12d0928.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/jb5oigH/go_kart_racing_xbox_one.pdfIn PDF document text
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/3819158.pdfIn PDF document text
    • https://cdn.sqhk.co/pibutuvopedu/xmjiBPF/fox_art_wallpaper_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/3IQjgja/amazon_music_vs_spotify_sound_quality.pdfIn PDF document text
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/f9b52.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/igDhfje/happy_hanuman_jump_game.pdfIn PDF document text
    • https://foroziroxodom.weebly.com/uploads/1/3/4/6/134647192/kifazomawigiduva.pdfIn PDF document text
    • http://imedo.ru/what_color_wires_go_together_in_a_car_stereossjjp.pdfIn PDF document text
    • https://jomigotub.weebly.com/uploads/1/3/4/7/134748998/sezegi.pdfIn PDF document text
    • https://pemanawawe.weebly.com/uploads/1/3/5/3/135320082/vurapelafaga_xinunabaluz_xatat_janurorif.pdfIn PDF document text
    • http://momijuluxesapek.iblogger.org/livros_de_agostinho_de_hipona_em.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/how_to_analyse_data_in_sql_server.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nimetegukixiz.rf.gd/nutrition_information_for_taco_bell_mexican_pizza.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/html_css_js_learn.pdfIn PDF document text
    • http://gonumarimemax.epizy.com/merog.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 5992 bytes
SHA-256: 7f062f2ec1ada5701273aab5cff818f70dde54470080522d0cb0d3509c6acad2
font_01_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 11512 bytes
SHA-256: 3a7abe2c887b0a79e12f28d96864b097958f6c55ed3465d4cddadc006cf8a51f
font_02_sfnt_off00013da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA2 16084 bytes
SHA-256: 6793135c9d5f2d9402216549edf66541f87ac1c2d7f717693568b2625ec966b3