Malicious PDF — malware analysis report

Static analysis result for SHA-256 672f70e6584b8187…

MALICIOUS

PDF

74.8 KB Created: 2021-03-20 04:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 73645bad731df8a5c3a325bd9552242f SHA-1: e171fbeeefb5f86c984641e58d144766a7ebf235 SHA-256: 672f70e6584b818700d42ec82bffbebaecd38baa6ffbe21a32b50cb9dbdf56e4
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, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to downloading an Android application, which is a common tactic for phishing or malware distribution.

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/123?utm_term=bloc+de+notas+descargar+android PDF link annotation
    • http://sbrf.link/sigma_509_bike_computer_instructionssljls.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/dulevemor-voxesule-wopuloz.pdfIn PDF document text
    • http://yandex-dostav.ru/600505566012m45a.pdfIn PDF document text
    • http://citimart.online/rakaxatokaninoxisaxegx6hl.pdfIn PDF document text
    • https://judupivaruva.weebly.com/uploads/1/3/0/7/130775992/5841584.pdfIn PDF document text
    • http://game-pro.xyz/la_palabra_rbol_es_aguda_llana_o_esdrjulaxdzqk.pdfIn PDF document text
    • http://shopsupergood.site/294890097784i5ex.pdfIn PDF document text
    • https://legaxebojidonet.weebly.com/uploads/1/3/0/7/130775342/7400218.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/55202ff6-7d28-4153-ad83-4f591d60de06/14454372257.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_3179ca5e65a341298937071687b468c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a28b15-22bb-4d50-9210-f3263c030dab/7619409428.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_467746b4e6b743bea779ffef0898bb81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31925dc6-5654-4735-ad80-cf49f684acb9/miwajijibutite.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_0fa7560314474899a0be22e5d5411ae7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ffa7d1-fd31-4724-8090-1c5380e98c85/how_to_use_presto_pressure_canner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1edd87c-63c2-4d85-8783-b2a384f7d398/how_do_you_use_jlab_wireless_earbuds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f223ed93-3b70-4a26-bca0-567a96233bbd/frases_sobre_poder_de_orar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c74500f-31e3-4c69-b448-9063134fb7b4/how_long_will_the_internal_combustion_engine_be_around.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_aae83ca37c404918a5d55463d101a446.pdf?index=trueIn 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_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 5156 bytes
SHA-256: 4647fe1f02fff718a15d8f1efe6ca35db9ed6bd30f79c51bf0c79846a353a25d
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 11820 bytes
SHA-256: 1006c19169f1595e12453e498a7af2063010bb297574f1ac3604b000248df721

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