Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d821ea48416254…

MALICIOUS

PDF

110.0 KB Created: 2021-03-13 21:33:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8e2d97d686e3603e33fcdb4911fd2a3 SHA-1: 731b6244e6dbe58a3a81ce22434685e083932983 SHA-256: 75d821ea484162540dafa1710cf0c51aebefbff2182959d6e775b74fb2ba304e
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'leonvi.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=chapter+13+algebra+perimeter+and+area+answers
    • https://cdn-cms.f-static.net/uploads/4457839/normal_602c66f39b764.pdf
    • https://cdn-cms.f-static.net/uploads/4389107/normal_603b6e62272d9.pdf
    • http://lovupijuti.getenjoyment.net/how_to_contact_planet_fitness_corporate.pdf
    • https://cdn-cms.f-static.net/uploads/4368503/normal_60339d70481f7.pdf
    • http://potoborotagivud.22web.org/41645345.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e4f47ab-3f9d-4ccc-8446-a783861818e1/zosapigox.pdf
    • https://uploads.strikinglycdn.com/files/3c8cd1bf-22ed-40c6-b038-be2f03c9b8e1/36157157529.pdf
    • http://gegivunijivi.rf.gd/wakilifomulezuropa.pdf
    • https://uploads.strikinglycdn.com/files/8bd5500d-9d77-4f07-8870-1eded048e8f7/what_can_i_make_for_vegan_thanksgiving.pdf
    • https://uploads.strikinglycdn.com/files/c5e61cb2-c7d5-4eb6-a4cf-4e12b1ef1033/39898619278.pdf
    • https://uploads.strikinglycdn.com/files/8ee04145-9357-4c96-a8cd-5975098a9218/the_lord_of_the_rings_the_fellowship_of_the_ring_full_movie_google_drive.pdf
    • http://pasufok.rf.gd/jirezogokosu.pdf
    • https://uploads.strikinglycdn.com/files/30f8485b-47e8-4252-9885-86595b0d13ff/is_harry_potter_cursed_child_going_to_be_a_movie.pdf
    • http://xolavozezimodan.onlinewebshop.net/what_do_the_different_color_boxes_mean_on_snapchat.pdf
    • https://uploads.strikinglycdn.com/files/6a0c183b-d412-4319-ab9f-a3435ae5c927/b_positive_blood_type_diet_chart.pdf
    • https://uploads.strikinglycdn.com/files/0e0b9218-2a00-4e56-a953-6960782e500a/41668833168.pdf
    • https://uploads.strikinglycdn.com/files/6375b24d-cd74-4988-b2d0-727d3ab784f4/basic_physics_concepts_for_high_school.pdf
    • http://nejarisiwudu.atwebpages.com/25356097580.pdf
    • https://uploads.strikinglycdn.com/files/ba0f80ae-747b-4ba1-a383-7567c55aa69b/mejiwoluser.pdf
    • https://uploads.strikinglycdn.com/files/276e9af6-43dc-49a7-8965-cb9e323095c1/sikefobasinadunin.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f8d.bin
ee8f10cf1454e5dec980c40b6613d183666dc6faf755791640e25de2c6ab0502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F8D 5728 bytes
font_01_sfnt_off000182e5.bin
dc74490757f8f0eb5740b73cbcd5a0136bd4e061d2acfd88fec54eeeea0e0301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x182E5 11504 bytes

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