Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d84194c676b418f…

MALICIOUS

PDF

85.2 KB Created: 2021-03-13 17:21:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fca769dd82d92460670e006387b0072b SHA-1: b92eb9acc3a2d0289f1b1be7092fda758c50d8f3 SHA-256: 5d84194c676b418fb82f48866cc62c3d9544d8bf5e03eb375b2a2b5e69d21a73
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains, a common tactic for link farms and phishing lures. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were extracted, the presence of many external URIs suggests the document's primary purpose is to redirect users to potentially malicious content.

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://jacksth.ru/strik?utm_term=do+chick+fil+a+salad+calories+include+dressing
    • http://vladmer.ru/the_shack_movie_trailersi4i6.pdf
    • http://nosumiva.mywebcommunity.org/one_day_more_les_mis_original_broadway_cast.pdf
    • http://noksipals.online/kitchenaid_artisan_mixer_attachment_packxjluf.pdf
    • http://robolab.one/what_does_democratized_knowledge_mean_answers._comj76zk.pdf
    • http://microbladingeyebrowsdallastx.com/xawulodopiduvimasisopahc4.pdf
    • https://cdn.sqhk.co/porosobof/ujg8jgR/zefegewagus.pdf
    • http://obmenkalnr.online/how_to_clean_a_30-30_winchester_model_94nky8p.pdf
    • http://filozajerezabi.getenjoyment.net/76359147926.pdf
    • https://cdn.sqhk.co/zijigemeworu/ejdyije/73244873246.pdf
    • http://ruwemipuwev.mypressonline.com/622617836.pdf
    • http://lorewipa.scienceontheweb.net/datap.pdf
    • http://boost-shop.xyz/highland_cathedral_sheet_music_organ_free0oa4s.pdf
    • http://tikovg.xyz/94411937234jnliw.pdf
    • http://nesorus.mywebcommunity.org/533861852.pdf
    • http://newipufisatag.scienceontheweb.net/social_work_research_definition_quizlet.pdf
    • http://hurleyshamburgers.com/19740139390flee4.pdf
    • https://cdn.sqhk.co/kidimezamos/NbTibav/hallmark_movies_now_cost_directv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1bf8cf7f-138e-4a10-9acd-dfc6d1a3b189/vexamalinodogom.pdf
    • http://xizokenimufewom.atwebpages.com/rain_bird_5000_mpr_nozzle_chart.pdf
    • https://uploads.strikinglycdn.com/files/b46118f2-6c74-473a-adc8-1d8c52a417fa/how_to_use_schrader_presta_clever_valve_pump.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faf1.bin
91e4a7ea87e6212d769f27b731186d4e3a9e2f9dd6c0e63fb9d7cc9a48a581d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 5348 bytes
font_01_sfnt_off00010d1f.bin
0d7df6bcc01e53d8f8066e59fce7b59557960326c1d7f473e64fec70ee4b84fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 10712 bytes
font_02_sfnt_off000131b5.bin
3f70697d8cfd0b9becff5adcad726f9ffedcc5d773cc6f7abbcc82b2f8034994		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 16164 bytes

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