Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51f52dad8b18ea8…

MALICIOUS

PDF

75.8 KB Created: 2021-03-14 01:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 36f73c1f048b1b86b8f5ae1e58eb64f3 SHA-1: b59c4e96799f037fa96b80d4c28bfd015277f3c8 SHA-256: b51f52dad8b18ea84c953cd84086424f31e3161463ec1807aaf76b12f12af95a
66 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URIs and the nature of the heuristics suggest a phishing or scam attempt designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wix?keyword=do+hard+things+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369776/normal_5fcbb0487eb7d.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/I4tje0E/exercise_ball_chair_amazon._ca.pdfIn PDF document text
    • https://cdn.sqhk.co/zudoputasafe/nBnzhaT/offroad_truck_climb_legends_mod_apk.pdfIn PDF document text
    • http://gidpopiteru.com/74056081084mud7i.pdfIn PDF document text
    • http://distornyup.site/86727381250em45m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_6039c88cc2467.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/hibcZgi/8242917834.pdfIn PDF document text
    • http://smartcreditscore.info/ccna_study_guide_2017eft53.pdfIn PDF document text
    • http://filmera.ru/xegibavowaviyaknq.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/h6jhzKu/dinib.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/ed23gcp/43330946882.pdfIn PDF document text
    • http://trenketo.buzz/faxodixosixezawojotisdswm.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/Ngijfih/jurassic_world_ios_tips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_603f81df3d4d9.pdfIn PDF document text
    • https://cdn.sqhk.co/pinufizugal/ZhdhjYp/malekuwajuxenatokazilitud.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/dxIsgib/70410851863.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/7db5ad8a-9f57-4f6f-a56e-fa40f074c43a/how_to_use_vsepr_to_determine_molecular_geometry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aafa1dd-cb43-4e90-b175-5e9d09bd49f5/normal_probability_distribution_table_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/54225568597.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/1487447288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86304bcd-0b8c-4615-863c-76668ad0e5cd/55252364302.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/lithium_ion_battery_basics.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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 5272 bytes
SHA-256: c8ca3f7e8c3de94c74f8276218676eaded44544276b54982d66b2c08439d20e6
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 10792 bytes
SHA-256: c6363b847a6c97f7bd691beb3998746e8aef71186466e13496c15aef7912cab2