Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3c20f3e1540298…

MALICIOUS

PDF

92.8 KB Created: 2021-01-31 23:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 46e392a995a7c32422ec4404935cfcf6 SHA-1: 9eadfb3984f06a42d3ca384218d4b6fcc0ab6236 SHA-256: 2f3c20f3e1540298644182b9f06350dfa7ab5e8bea2ccbe3e4b50a08d29ac71f
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the suspicious nature of the embedded links. While no scripts were directly extracted, the structure and embedded links point towards 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://trafffe.ru/wb?keyword=vex%20robotics%20curriculum%202.%201 PDF link annotation
    • http://srakan.space/weird_sound_generator_schematicipyw6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407756/normal_6014fdceef0a5.pdfIn PDF document text
    • http://daliadiago.com/furowab5r4a2.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/parent_portal_pisd_princetonb084m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420434/normal_5ffbbd1a766cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5fc6560dd40f5.pdfIn PDF document text
    • http://shopsupergood.site/addison_wesley_chemistry_textbook_pdn10lm.pdfIn PDF document text
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/c98a0d65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_5fd711796b5d9.pdfIn PDF document text
    • http://899themes-demo.ru/instagram_captions_for_selfies_in_bedh6wzb.pdfIn PDF document text
    • http://talebakela.iblogger.org/comma_practice_worksheet_high_school.pdfIn PDF document text
    • http://brumbum6.xyz/nike_brand_guidelines_20200u1s3.pdfIn PDF document text
    • http://winwites.space/national_geographic_marble_run_large6w591.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/lezirep2g4l7.pdfIn PDF document text
    • http://kismyketio.com/gukewarogoxabazelexuvimoyny6t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogivumomu.epizy.com/avicenne_energy.pdfIn PDF document text
    • http://fosekor.epizy.com/vijorivupavejop.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_off00012ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 5124 bytes
SHA-256: 2f9bf97878632ec56854b54460c2028efc071b0aa71478a638e74ec06d1f683f
font_01_sfnt_off00013e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4D 11788 bytes
SHA-256: 98fdf95dadbeaf8b87c44dd8bf7b454281360cd8697f8fcec2ce66a93b509778

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