Malicious PDF — malware analysis report

Static analysis result for SHA-256 50814acbb0281d3a…

MALICIOUS

PDF

75.6 KB Created: 2021-03-27 21:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 543e6ea94bad5bf836f916d939496474 SHA-1: 12defa76abcd50bfed730ae2102157c90d66cbe8 SHA-256: 50814acbb0281d3a0a11f0ddbeaefc812159b4c9aa7879138b635e263254855b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for phishing or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external URLs and the overall structure point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=3rd+grade+math+workbook+pdf+free
    • http://xakubogika.22web.org/casio_f91w_colors.pdf
    • http://magazinrf.xyz/28578729320if8hx.pdf
    • http://ontrade.top/71041631537fg6b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lofetumavigasi.epizy.com/6771452984.pdf
    • https://uploads.strikinglycdn.com/files/ab9d5137-9e81-43d8-b155-6715dd5996a0/vipamelesakijiwum.pdf
    • https://uploads.strikinglycdn.com/files/cb399d4c-1e42-4a25-9b0f-a3b9c28717d8/vuponafipovadaxidozuku.pdf
    • https://uploads.strikinglycdn.com/files/5a53d383-98a8-4a0b-a60f-3b350eff7090/hp_pavilion_dv6_drivers_for_windows_7_home_premium_64_bit.pdf
    • https://uploads.strikinglycdn.com/files/5c80e3d7-1b51-4702-9383-3b63f2e8f984/how_to_align_canon_printer_mx490.pdf
    • https://uploads.strikinglycdn.com/files/8ba1e44a-484d-4700-b73e-5010f0588c6a/portland_or_light_rail_routes.pdf
    • https://uploads.strikinglycdn.com/files/4e259d6d-267a-4108-bd1d-3ff3c465b1a6/lean_analytics_book_download.pdf
    • http://rujipezoj.epizy.com/67765721345.pdf
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_9a50d9ee50bd46e89d1a3c1aece3eb65.pdf?index=true
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_5c8d3ce24d704308ab3fbbe43bec088d.pdf?index=true
    • http://javolijokexike.epizy.com/97835347551.pdf
    • https://uploads.strikinglycdn.com/files/ac7a0cf9-2c91-4d0e-a8c5-d7c72771e1a5/vosuwuxigubolemedinexa.pdf
    • https://uploads.strikinglycdn.com/files/5399fec2-1468-4f7e-a74f-3bda643bd120/sennheiser_rs_160_wireless_headphones_manual.pdf
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_49961fa9b81249049972f32f0e94f7cd.pdf?index=true
    • http://vimiromomekex.epizy.com/determining_the_limiting_reactant_lab_answers.pdf
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_a8b1a44b40854455a8bb481a877cf0e4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f32a815-5256-4945-b920-3659073590b2/bollywood_songs_guitar_tabs.pdf
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_82a25da9202a46b58dd66eb916f19f31.pdf?index=true
    • 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_off0000ea9c.bin
ebe5e62321273c27fd12aa2a8413f54b2d3dd8603d28d0e087aafd4c108ee587		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 5608 bytes
font_01_sfnt_off0000fd99.bin
dde8c637331891c73a4d94de8df8619554cbd359e01123e88b7032100f8153c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 10360 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.