Malicious PDF — malware analysis report

Static analysis result for SHA-256 0841dad1d397c116…

MALICIOUS

PDF

78.7 KB Created: 2021-04-05 16:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: acd2b935529e84232851db325b7fa309 SHA-1: b4115d104d0ff0f972ca756c68ffada226d13492 SHA-256: 0841dad1d397c1169d2f8ace1abd943037c58b9846afceca444ecbf2e4991bfb
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are presented as search results for sensitive topics like election results, suggesting a phishing or credential harvesting lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed for SEO manipulation and potentially malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/award?keyword=lok+sabha+election+2020+results+state+wise+pdf PDF link annotation
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/rilufomozodukavunig.pdfIn PDF document text
    • http://rogijowop.sportsontheweb.net/tukijulaxu.pdfIn PDF document text
    • http://persequenteamsohbet.com/aditya_verma_teaserxldki.pdfIn PDF document text
    • https://wuzesitawe.weebly.com/uploads/1/3/4/7/134733123/8523365.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/buwuluw.pdfIn PDF document text
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/finifinem-pegejavotubis.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/dosijod-kizaja.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/samsung_electrolytic_capacitor_datasheet.pdfIn PDF document text
    • http://copyrighthelpptteam.com/hero_wars_halloween_event_2020_hidden4esrd.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/rasusaduronulad.pdfIn PDF document text
    • http://idealica-ordina.site/halo_custom_edition_product_key_generator165bf.pdfIn PDF document text
    • http://priz24.site/mbo_folder_service6tm4f.pdfIn PDF document text
    • https://kepefiporewe.weebly.com/uploads/1/3/4/7/134704647/xonudesuwonijuv.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/nagudo/baldurs_gate_2_enhanced_edition_ps4_review.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/hollywood_bodyguard_movie_songs.pdfIn PDF document text
    • http://favepos.rf.gd/80328664417.pdfIn PDF document text
    • http://zalatikewal.atwebpages.com/belajar_bahasa_arab_bagi_pemula.pdfIn PDF document text
    • http://manovotiduzabes.rf.gd/punctuation_worksheets_for_3rd_grade_free.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/90958136847.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/christmas_carol_songs_mp4.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_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 5756 bytes
SHA-256: 9e809abcd2026a3b9b3e7658c62e5279380297d6b4e9c01073abba35025a8caf
font_01_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 10952 bytes
SHA-256: 4e33905887d89425485bfce3ce51456e01dd8806098f6b13b6b1841019087cf2

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