Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56d36834a7f9f1a…

MALICIOUS

PDF

74.0 KB Created: 2021-03-15 21:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5912b31827fe2e0a21f16391093c7888 SHA-1: 936184aabd7583e8a6e9e9d384e266fae1600581 SHA-256: f56d36834a7f9f1a7fdb8bb56dcc4ea3029e56bc777472a7d229099bc08cf948
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=jay+m+robinson+middle+school+supply+list PDF link annotation
    • https://cdn.sqhk.co/vumuwuxa/jgdhdhg/demon_slayer_rpg_2_wiki_water_breathing.pdfIn PDF document text
    • http://dujalubudekir.22web.org/wowoxizexepatafitiru.pdfIn PDF document text
    • http://uabiomanix.xyz/batla_house_movie_full_hd_filmywapwoaek.pdfIn PDF document text
    • https://cdn.sqhk.co/mirofifuba/bgdjeUG/popular_house_music_songs_2020.pdfIn PDF document text
    • http://doordash.fun/347240379907fewx.pdfIn PDF document text
    • http://50offstore.pro/paketipakujigafujexaziltan.pdfIn PDF document text
    • http://lunurapezos.iblogger.org/60275037707.pdfIn PDF document text
    • http://profyhouse.ru/define_economic_interdependence_example803q5.pdfIn PDF document text
    • http://dontbeshy.xyz/wijuzoluribobabenow6r8b.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/ihYggih/61672836128.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/gdgfghA/46464102344.pdfIn PDF document text
    • http://adyga.site/base_of_skull_anatomyzibic.pdfIn PDF document text
    • http://whysmall.space/93919822176silsu.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/ruger_lcp_crimson_trace_pocket_holster.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_ba80ba2ae99747e6bd13d62906631256.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_c1da76f57676499bb95e8e5bc8cd2e3c.pdf?index=trueIn PDF document text
    • http://petojijoxura.onlinewebshop.net/zisop.pdfIn PDF document text
    • http://nifiloxoburufi.rf.gd/angular_prevent_form_submit_on_button_click.pdfIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_8f431e59e2ab4c74b6d274ae2003d97f.pdf?index=trueIn PDF document text
    • http://zekovulelopur.epizy.com/30301425125.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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 5544 bytes
SHA-256: dcf51cef2e8eb65a68b7763302f8431205659335893b413d2a4d4d00b900b84c
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 11568 bytes
SHA-256: 4be32ccb33617c05934694ee4286ce2b9c10dc1315823476c12b177eaeeae88a

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