Malicious PDF — malware analysis report

Static analysis result for SHA-256 2218b6ad71bcf0db…

MALICIOUS

PDF

95.4 KB Created: 2021-02-24 21:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ffb1d15f3a4714a0d5717b974f091500 SHA-1: 9df4048f9bdb5cddc92c8d1fedc4a2d5f9d0a9de SHA-256: 2218b6ad71bcf0dbd759c3fb3a110e17c9b437fd28bb781220ccc07870127296
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 hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the heuristic rules suggest it's part of a link farm designed to distribute content or redirect users. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malicious content delivery 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://seumenha.ru/award?keyword=icebreakers+for+kids+online PDF link annotation
    • http://xuwuvewisin.mypressonline.com/shark_duoclean_powered_lift-away_speed_vacuum_filter.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/jjccNje/99247275746.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/219710fcd8fce.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/d3de0fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490265/normal_6008102daaec9.pdfIn PDF document text
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/fa0d20.pdfIn PDF document text
    • https://cdn.sqhk.co/noxavuris/hicwZji/dove_channel_free_trial.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/hbgeja7/bubble_wrap_popping_app.pdfIn PDF document text
    • https://jaxevilin.weebly.com/uploads/1/3/1/6/131606955/d94c40ab2cbc.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/dasomavojazifo-vobefavujuf.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/ejjjhxe/voting_presidential_election_2020_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_60347169e43bd.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/korula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifexizeji.epizy.com/leworupolodavame.pdfIn PDF document text
    • http://podatef.rf.gd/33033922800.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/water_cycle_worksheet_for_class_2.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/xogugefefolu.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/words_that_start_with_zax.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/which_is_the_best_denture_adhesive_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/julepifobabafarajujo.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_off00013a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0E 5156 bytes
SHA-256: c6d91cdab5fd2cac8e406675654cce243d9f126af092e5f4342d458e7f78351d
font_01_sfnt_off00014ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA8 10672 bytes
SHA-256: 55327921a60216db553824315479095ad164b3ae9e6ed07a01cdbb2c75671e68

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