Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57e23a19b6c6907…

MALICIOUS

PDF

70.4 KB Created: 2021-02-24 02:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 0012ca115f09de00fbbf5f48e0f8fb55 SHA-1: 3f71da8298d8f1386c5d57540cb5f873bed060e4 SHA-256: f57e23a19b6c6907b06fa0ed832bad7e9912f2e10b68ca4c02321048e8f2027f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a campaign to redirect users to malicious sites. The document body, though malformed, contains keywords related to a grammar workbook, serving as a lure.

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://jacksth.ru/wb?keyword=modern%20japanese%20grammar%20workbook%20pdf PDF link annotation
    • https://gamitodotabezoj.weebly.com/uploads/1/3/1/4/131453651/c5c52e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_60241fb5e5cf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5ff966793f3d9.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/gohcXxs/gewilud.pdfIn PDF document text
    • http://bapewagidedexe.22web.org/modern_architecture_since_1900_william_j_r_curtis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470825/normal_5fdbfedf4b975.pdfIn PDF document text
    • https://lowixuwegula.weebly.com/uploads/1/3/0/7/130775587/65b83f83c19f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juwesavel.rf.gd/jukabajexez.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/fuzofubidikovesepipaxo.pdfIn PDF document text
    • http://pitareri.rf.gd/best_free_gps_app_for_iphone_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/urinary_system_diagram_worksheet.pdfIn PDF document text
    • http://ronaxunejononot.rf.gd/blackhatworld_seo_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/cheat_sheet_for_flash_photography.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/bambusa_pro_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/logo_game_answers_level_28.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/debt_acknowledgement_form_template.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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 5708 bytes
SHA-256: de2d9d0f86c398ccd946a99e45bf95e2876c54de86b8297404aee9b8113765c3
font_01_sfnt_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 10388 bytes
SHA-256: d1c4b75438a6521e90023cc4e63220cd3b4563543eba1a25437e241832129b6c

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