Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d45bc48494dfc2…

MALICIOUS

PDF

73.1 KB Created: 2021-02-23 14:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0ec373ee741fade8e375c0c97b9ac313 SHA-1: 81e69597a01705f6cbba4dac3183c8690cd3ebe3 SHA-256: 65d45bc48494dfc2a7a711d5ef94a96cd887dae14d9150d68bfcc4815d043b9c
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 link farms, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing, aiming to redirect users to malicious sites.

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://druttle.ru/strik?utm_term=beyond+celiac+gluten+free+diet PDF link annotation
    • http://universal-kirov.ru/zojexevotowamosewawabipv79i.pdfIn PDF document text
    • http://citruss.space/abbreviated_electron_configuration_sodium_ionuo85p.pdfIn PDF document text
    • http://lorenbayi.com/buveropowemamef21tc8.pdfIn PDF document text
    • http://prizinsta24.site/best_mystery_books_for_book_club_2020nmcf3.pdfIn PDF document text
    • http://ejinaya.com/administrao_de_marketing_kotler_re74sa9.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/agg6Zhf/watch_rocketman_streaming_free.pdfIn PDF document text
    • http://semengergel.ru/ax_2012_interview_questions_and_answersvrrke.pdfIn PDF document text
    • http://trend-sales.fun/32431739264io9ax.pdfIn PDF document text
    • http://whitecheat.xyz/sony_hdr-sr11_specsj6t40.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/jdjdgjE/granny_spongebob_mod.pdfIn PDF document text
    • http://gatorama.site/zorba_the_greek_dance_musicm5d0p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/vituvuwipijixu.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/vidmate_apps_install.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/sbi_new_atm_card_application_form.pdfIn PDF document text
    • http://dalotidel.epizy.com/lelelufabijomawivavatukes.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/neopets_battledome_guide_for_newbies.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/not_to_answer_meaning.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_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 5164 bytes
SHA-256: f5b16351042896cd1f64726fe29595473647be8030b1dd33647c3319d2c18d98
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 11816 bytes
SHA-256: 21bb8cf0d10a3674fd8204cfe51eb85dbf1eacdc79b216bdff877361026e3ed6

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