Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1b1ebb5ef2bd1d…

MALICIOUS

PDF

70.4 KB Created: 2021-02-13 13:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e99d6fa1d0d87db4c831e2cd49d1b331 SHA-1: 733600b064b869bf40c4d7c7ce1ecd091534fcbc SHA-256: af1b1ebb5ef2bd1deab6e994ed693c0f4868ffb0de2561fd02f8b59f5948660d
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded URLs likely lead to further stages of the attack or directly to phishing content.

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/aws?utm_term=best+certificate+design+software+free PDF link annotation
    • http://azules.ru/8309245357g82as.pdfIn PDF document text
    • http://fixmarker.fun/fallout_shelter_wiki_roomsttqo4.pdfIn PDF document text
    • http://cmbespaceclient.xyz/zekozamhaww.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/jijhPQe/minecraft_pe_bedwars_online.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/hiPjdjh/twisted_x_mocs_steel_toe.pdfIn PDF document text
    • http://bobr.space/beauty_and_the_beast_scriptrj53s.pdfIn PDF document text
    • http://vclean-sale.shop/lord_shiva_hd_images_free4psqh.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/jhbHo6a/truth_or_dare_game_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/varipivokil/jcCjbgc/giwidov.pdfIn PDF document text
    • http://alsamcctv.com/lista_de_adjetivos_em_portugues6c7pi.pdfIn PDF document text
    • http://itsnat.space/manual_rdio_cdp_2700_capitolu7nhc.pdfIn PDF document text
    • http://damvglaz6.xyz/extra_utilities_2_filteri4ds4.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/ji0mifC/descargar_wolf_online_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/duxapotor/Jghjahi/wilugoxuzoxidaso.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/vekodupiwarobi/buffalo_wild_wings_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/shin_chan_comedies_in_tamil.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_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 5300 bytes
SHA-256: f3bcc8ea1682065840f1bfaa0072be841af91b20c13badef46b3de0b3aac07f6
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 11260 bytes
SHA-256: 3ad82ed54c425ce19901dcf71c3c9ea8e5ca29c6d0c99bc387e517450abb2b53

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