Malicious PDF — malware analysis report

Static analysis result for SHA-256 57186f0b039d2744…

MALICIOUS

PDF

79.6 KB Created: 2021-02-26 22:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d66c76f17a43a6d994ac2dd813c76d6f SHA-1: ef3e2e6d2d0b385f0749619392c152e9410811e2 SHA-256: 57186f0b039d27448ba0cdd7588269ec1434d86606c31d31dd9ea5eee8851421
134 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS. The embedded URL points to a domain designed to mimic a legitimate sign-in page, strongly suggesting a phishing attack. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=wall+street+journal+sign+in+page
    • http://lnstagramcopyrightcenter.com/dosubabifx17sr.pdf
    • http://leqqurint.online/verivejitafiset3vlec.pdf
    • http://filuniguwol.22web.org/compressed_air_piping_design_guide.pdf
    • https://cdn.sqhk.co/jebuxanit/2hjgulF/little_heroes_dental_san_juan.pdf
    • http://abreudesigns.com/download_game_basara_2_ppsspp_android_isod85tm.pdf
    • http://smartcreditscore.info/baaghi_2_videoetz9v.pdf
    • https://cdn.sqhk.co/bitizulokiva/fheih7S/motul_coupon_scan_app_download.pdf
    • http://buybritishcat.com/xobutuvic2osw.pdf
    • http://beliyden.xyz/mystic_messenger_phone_calls_answers7mecm.pdf
    • http://xtw2.club/zekesamunajag93o1m.pdf
    • https://cdn.sqhk.co/pifajaloro/afq9jjF/fuvusewumapiget.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vonuxagupeduze/ullathai_allitha_tamil_songs_masstamilan.pdf
    • https://s3.amazonaws.com/xidulumexi/hindu_calendar_2020.pdf
    • http://xoxigibutu.epizy.com/new_baul_song_2019.pdf
    • http://zanebinelit.rf.gd/fubujeliziloxomegaxaxi.pdf
    • https://s3.amazonaws.com/fejakixoweka/wojozivagopekataxewep.pdf
    • https://s3.amazonaws.com/dorulusof/ocarina_sheet_music_zelda_lullaby.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b3.bin
51299a3ab67d15c048d247ff50a1ba964cf5805e071cf0fb2ab9e3b40235e2fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 5076 bytes
font_01_sfnt_off00010b1b.bin
599bc3f77ac39e47df72c9187f82b7f0eb52f5d0552ab2921c810bba27f0824f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 11228 bytes

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