Malicious PDF — malware analysis report

Static analysis result for SHA-256 6389bae512a90cdb…

MALICIOUS

PDF

81.0 KB Created: 2021-03-22 14:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 01b7f6d6b1da905f05bcf4e691141674 SHA-1: 8011156e628691136c6daa4676cac4bd0b6a21ee SHA-256: 6389bae512a90cdb3cd799d78b1bb3e04cbbbf60b50d66ec1bfc277e728e0f33
66 Risk Score

Malware Insights

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

The PDF contains embedded URLs pointing to suspicious domains, and heuristic analysis indicates it functions as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

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://vilenefex.ru/award?keyword=adjetivos+en+ingles+y+espa%25C3%25B1ol+lista+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422638/normal_5fd68d479339f.pdfIn PDF document text
    • http://the-glow.ru/84814755362wl2af.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/nAheHT2/vodafone_4g_recharge_plans_tamilnadu.pdfIn PDF document text
    • http://shoop-fh.ru/botanica_oculta_en_medicina_gratisnp4sz.pdfIn PDF document text
    • http://xploitcrew.io/sherlock_the_abominable_bride_script0ufc0.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/dhcjqia/desamulazedifijodegatoros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_5fe99576d45dd.pdfIn PDF document text
    • http://kyukty68.xyz/epcot_centre_map0prnu.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/ggd1gi8/wetegisisijapabuw.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/d21f9359-f7f4-4dc5-a388-5cb1ca80865e/wenofewi.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_efeca02a5d4d4137a11276867dffdf95.pdf?index=trueIn PDF document text
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_93971127ffb24bea932cdea2d0f23409.pdf?index=trueIn PDF document text
    • http://kitalanexu.epizy.com/tivikemeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a070646-ffdb-4089-8e61-0b8f4ddbfd1c/ps3_data_is_corrupted_8002f957.pdfIn PDF document text
    • http://xodepew.epizy.com/66591872078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b42d7e6-b960-4e25-8661-c563c7d202b7/how_to_change_old_honeywell_thermostat_battery.pdfIn PDF document text
    • http://siwebojik.epizy.com/user_templates_word_2016.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_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 5552 bytes
SHA-256: 1d55af2d96a439012f1b42d69e827f7be9fbcdc34ab360557bc0a43b3f2584de
font_01_sfnt_off00010cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 12364 bytes
SHA-256: 3656aaf4095c28064d1d8b05167b1b4e20e1921982a3545c07b34eec424c9971

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