Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd23363d2a653cc…

MALICIOUS

PDF

79.3 KB Created: 2021-02-28 08:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 11f33bc2663f1eb2db514952d251b343 SHA-1: 5cd73a053c9f15821e88a3aede42e83b158454ed SHA-256: 9bd23363d2a653cc94e300a4d1c1333f40ff35b7ac9020f8a4fa598572ed425b
86 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for distributing malware via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://pelibifir.ru/123?utm_term=graphing+linear+equations+worksheet+grade+8 PDF link annotation
    • http://vertigoa.online/angular_5_bootstrap_form_validation3p95g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444357/normal_5ffe1d6aa5dd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5fe3820217046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481168/normal_60341bb16cdf5.pdfIn PDF document text
    • http://getbuiss.online/meeting_room_management_software_outlookrru5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_602fff152a3b1.pdfIn PDF document text
    • http://cenderaoriginator.com/how_to_check_sap_exchange_ratejx3c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_60279a6b23ada.pdfIn PDF document text
    • http://reduslim-ufficiale.website/frog_fractions_text_adventure_guidelsn6p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417530/normal_6022e6d182812.pdfIn PDF document text
    • http://pomirkapa.site/junko_enoshima_pose0nil1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_6027986dce11f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_6009797d2ad2e.pdfIn PDF document text
    • http://cashbackmoney.info/pdf_to_dwg_online_no_emailqqgli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381751/normal_5ffc8169b4e87.pdfIn PDF document text
    • http://helpverifybadges.com/51612400446pafwp.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/luxaduzimase/angry_birds_transformers_list_of_characters.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 5728 bytes
SHA-256: 5d0085867ecda822513ae965df9a8b86a19fb431e328c2aefab83738614ea199
font_02_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 11348 bytes
SHA-256: a6a692a49a69c3999f963302d6c9bde4ee7aa3522e5691f87a377b4e4a8d809f

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