Malicious PDF — malware analysis report

Static analysis result for SHA-256 93eb7eb12a68f521…

MALICIOUS

PDF

80.0 KB Created: 2021-03-18 03:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ece16e4dd3e9e96b481d519860a4f73c SHA-1: 2839b7434c4225eca35a685f522417ed1586dd5a SHA-256: 93eb7eb12a68f5211e1435aa8a6813cfd22a39320277dcf31c6d94b3a99dd0a1
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, suggests a lure related to 'solution concentration worksheet answer key', which is likely a pretext to drive users to malicious sites like 'https://nipisod.ru/wix?keyword=solution+concentration+worksheet+answer+key'. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://nipisod.ru/wix?keyword=solution+concentration+worksheet+answer+key PDF link annotation
    • http://xegazinijitup.mywebcommunity.org/54424937606.pdfIn PDF document text
    • http://freshka.fun/backend_template_yii2tddam.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/how_much_should_it_cost_to_repair_refrigerator.pdfIn PDF document text
    • http://stnold.com/99444578249vwgzy.pdfIn PDF document text
    • http://heretythere.site/fractions_worksheets_year_35pdit.pdfIn PDF document text
    • http://freshka.fun/fukeburenilekumukarurv4.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/71622248038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a236ea67-6304-4808-8674-4496a19a4eec/41111438977.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/jarawofekixifejetevavir.pdfIn PDF document text
    • http://sajokebebax.rf.gd/80586723650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b4edf23-e577-4458-a1d6-f4e914d7c07c/84949380603.pdfIn PDF document text
    • http://gonuwufif.epizy.com/cameroon_passport_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/crbsi_idsa_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a92968-a76c-4e5e-a29c-89ae23265a98/bujemiwatalokejize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c6f461-87fa-40e6-990a-b5a53ba2a8f6/78448712538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bce796-eedd-4c9f-81bf-3f1823e17f93/funotazajofetemufowakep.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/8278495713.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/how_to_analyse_risk_in_business.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/worx_electric_chainsaw_14.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_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 5248 bytes
SHA-256: bfcb93043c8d92f72da741f192d4c5a96b54e07c717f219d6482892e0ab9c94c
font_01_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 11664 bytes
SHA-256: ac6f1fa3feed9afd70d490e39208c3ce5c96aba977178ecc94fba33fda69f324

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