Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51e9f8d7e502bb2…

MALICIOUS

PDF

75.1 KB Created: 2021-04-01 05:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 505891bf18bab92b8e1949a0e6779501 SHA-1: 23025bbf1767a9635aac7cc86d793989c526ee83 SHA-256: b51e9f8d7e502bb2470bd1fa1a628f25d8f295fa6809ad86b410a480f52f6cad
74 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a heuristic firing for a 'disposable link farm', indicating a strong intent to redirect users to external, potentially malicious, content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. While no scripts were directly extracted, the ML classifier strongly flagged this PDF as malicious, suggesting it likely contains obfuscated JavaScript or exploits.

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://xajibur.ru/123?utm_term=boss+baby+font+free PDF link annotation
    • http://jirenaxapibetig.scienceontheweb.net/nobifumorekudigitadu.pdfIn PDF document text
    • http://novubelugalij.medianewsonline.com/92282521469.pdfIn PDF document text
    • http://keluzizizeroki.getenjoyment.net/catholic_encyclopedia_vol_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_603f3e647c08f.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/pumurugovefuwivelififikox.pdfIn PDF document text
    • http://putifid.iblogger.org/54382838929.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/jfginvP/home_depot_furniture_assembly.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/laboratory_equipment.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/bNidKhb/comparatives_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471085/normal_5ff081d8d9cd5.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/c9a2b02c5e7d0.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/e_waste_management_report.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/jh0YY0f/car_racing_games_unblocked_66.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/jhCouge/vumarogatedumodevirop.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/1806381.pdfIn PDF document text
    • http://kiratemize.22web.org/tokanixipigulufis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455370/normal_5fc8a4b8f2e2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japinoxizidunub.myartsonline.com/what_does_the_word_sun-dappled_mean.pdfIn PDF document text
    • http://xofemamerisip.epizy.com/48946849286.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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 5020 bytes
SHA-256: 65c6907894ec05c9673a4931cc81b933966201e9fd82de97b9bc9f313c4a4c74
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 10844 bytes
SHA-256: 97a9ac7c0bb6fe9246b90aa7123cb09420ee83db9b4c37f265f5d8ce50bc4144

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