Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b597ab424025d1d…

MALICIOUS

PDF

89.3 KB Created: 2021-05-09 16:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1ca5ed87d78918812700396c98cf5680 SHA-1: 07f20ac7a0dadfe37c8097859d50d833a95bb6cd SHA-256: 3b597ab424025d1d252574ba9b751e78799648448a6c26e90d6ae99ebd202774
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=what+is+the+royal+standard+of+england PDF link annotation
    • http://tk-time.site/48327806380qt0ve.pdfIn PDF document text
    • https://kovumagamu.weebly.com/uploads/1/3/4/5/134578336/9e2ba.pdfIn PDF document text
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/2263920.pdfIn PDF document text
    • http://starconflict-game.ru/balu_mahi_full_movie_300mb_freewieoq.pdfIn PDF document text
    • http://kersita.space/carboxylic_acids_nomenclature_worksheet3lnnr.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/0c3dfcb08b6.pdfIn PDF document text
    • http://firstflirts.site/high_rise_condominium_design_guidelinesz5eto.pdfIn PDF document text
    • http://wrestling-mma.com/21092367477lpsam.pdfIn PDF document text
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/kiwutuwaz.pdfIn PDF document text
    • https://dujolisinapujis.weebly.com/uploads/1/3/4/3/134328324/tutexigakalikesinid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_d62ca8c533624349b4583ead0710aecd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9a4148-57d5-4a4b-8ff4-6ebc195f606c/31826382886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c2e6ec-9166-4ac0-9111-5b77f1de2948/what_kind_of_battery_goes_in_a_honda_key_fob.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/toefl_reading_practice_test_with_answers_2020.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_30eb21644e0e4eecbe720d5e139eeb9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bd7d9b-3b6a-47aa-9eb8-e0f009156c5e/33246339312.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/how_to_set_up_voicemail_on_this_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58d60e4-5f25-426b-826b-61d13a24465b/lg_inverter_v_heat_pump_cleaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bbd8838-e127-4da6-b7bb-83db19c465b6/amar_o_depender_libro.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_d68e5bf191864422999e921d471ca063.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_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 5284 bytes
SHA-256: dbf67eb82c1f98741cf26188e572114096aaefb3f02191a4ce6f51908778512e
font_01_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 11004 bytes
SHA-256: e3736f1d54f9f5c4a2739508fab342ab9b5c541e7ee2edf866b7e42eb6856749