Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbfe8bc226774da…

MALICIOUS

PDF

65.2 KB Created: 2021-02-14 22:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 90c9d94913f8684ba3c52bb374d436c7 SHA-1: fe430d62e30e589bf0d99b3fe128df4fcb8c5a5f SHA-256: fbbfe8bc226774da81d805bc22017fdc4701aedaa472c4026fd6da3a4d7b06ba
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to phishing or malware download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate attempt to obscure the final malicious destination.

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://jottigo.ru/aws?utm_term=conjunction+worksheet+3rd+grade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5fd085956e9cd.pdfIn PDF document text
    • http://interior.estate/137011806782ywa5.pdfIn PDF document text
    • http://lakulikelanu.iblogger.org/bangla_album_song_zip_file.pdfIn PDF document text
    • http://vvinorama.website/wiwetezuwugya359.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/battle_royale_game_offline_apkrmbjs.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/E6lieij/pijafixixev.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazazu/hjRfBRv/43855511478.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/YMhbM5L/moonrise_arena_pixel_action_rpg_apk.pdfIn PDF document text
    • http://cheapkeys.site/buduguna_songs_mp34umal.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/ihRiLih/how_to_download_tiktok_for_younger_users.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/ht7ojhE/pedokuriva.pdfIn PDF document text
    • http://leyloften.online/kijudelopugupatuvabiwpc0e6.pdfIn PDF document text
    • http://shoop-fl.ru/85826567902a35z3.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/4z5WjjA/fall_stardew_valley_best_crops.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FD 5472 bytes
SHA-256: c2ad5e211ddf6ade17dddb8176fbd72d4eed75120072b8cc566bbc7d20892396
font_01_sfnt_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 10080 bytes
SHA-256: fd19015a69e0dfe4e696a5cb3e4ee8ea738f9e1d9459c122a7a0761d805299b2

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