Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e18dc9b06e2e749…

MALICIOUS

PDF

83.9 KB Created: 2021-03-21 08:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9f310014ce6f607566e3c3b1dc682a82 SHA-1: b28c03a7e54af67a7e83618fd7f6ad65e21cb380 SHA-256: 3e18dc9b06e2e749b95454a2bd8e9ddac3d7022ef927b579a7e9ce55d65f0aee
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document, disguised as a worksheet, contains an embedded URI pointing to a suspicious domain. The ML classifier strongly indicates maliciousness, and the presence of a 'download button' heuristic suggests a lure to download further content. The document's content and structure are consistent with a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://midufefew.ru/wix?keyword=solving+quadratics+using+square+roots+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446774/normal_60060ed24d87a.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/gchdG3L/pc_games_black_friday_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_602000268bd1a.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/FhhymZJ/50428757794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482188/normal_60094f98981c2.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/jjIhbrB/48713128359.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/0ididja/clover_go_app_and_contactless_reader.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_6012df38912da.pdfIn PDF document text
    • http://all-host.site/blender_for_dummies_free3b175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401716/normal_5ff713340b8c7.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/doJhhjc/davepojaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_605156a43d6e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426695/normal_604023ad46f52.pdfIn PDF document text
    • http://ductsunlimitedins.com/is_the_2009_subaru_impreza_reliablelkene.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_f3591326d9c242c880b59e1c7a1e656f.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_3ff0041bb84c4030ba780ef809541884.pdf?index=trueIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_b58d5570808b4e7d8e1093b5bfb250d4.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_9a08382f91bc437ea187b2a5bfe64989.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_2c538c6f20e04677b59166638af7778a.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 5648 bytes
SHA-256: ae568f8091802443b07b84fa1d8d60383e9dbe1b33723251f2d1d5da357325c5
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 11572 bytes
SHA-256: eabf5b030e7c376d9cf3442d99910ae4c8a0891da94ccd9a1d82b1a1364cdded
font_02_sfnt_off00012b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 16064 bytes
SHA-256: 1398bbf2dfd9cae4409d1d8ab67a79f495e147aa07cce54436be1c2862721d78

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