Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b739d6a1947925…

MALICIOUS

PDF

68.5 KB Created: 2021-03-28 05:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72438ad722f8e8df886c8773e02831c6 SHA-1: 3397fc759a34f099f0e095c196216426bb40cc06 SHA-256: 53b739d6a19479251c6cedb59005f6274fd3c3bf514e58f0a5ba15412df148f7
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/award?keyword=ejercicios+de+conversion+de+temperatura+celsius+fahrenheit+y+kelvin+pdf
    • https://depuxozepol.weebly.com/uploads/1/3/4/3/134377374/7a0dca5fb.pdf
    • http://xufuzema.sportsontheweb.net/89477924442.pdf
    • https://taxajefikudo.weebly.com/uploads/1/3/4/7/134765143/4298516.pdf
    • https://newogofifexepe.weebly.com/uploads/1/3/4/8/134884114/gakixipuve.pdf
    • https://fepunasavejupab.weebly.com/uploads/1/3/1/3/131381111/2206719.pdf
    • https://rigozanukamesok.weebly.com/uploads/1/3/4/5/134508669/gidovikigis-jifenafek-xeropa-tuputiraka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/feec342c-d3a7-44d0-8748-269cae3129b8/python_code_to_create_table_in_hive.pdf
    • https://uploads.strikinglycdn.com/files/fc740b53-0632-46c8-bf1c-078cba77b3f1/what_is_the_importance_of_statistics_and_probability_in_our_daily_life.pdf
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_6c6ee81101f048f0b0dce3aa4777019f.pdf?index=true
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_56766e9da27544728d4e241beeb2f2fe.pdf?index=true
    • http://mevediruzorapaz.rf.gd/nirarajogefozari.pdf
    • http://segimoto.myartsonline.com/kodefoxuku.pdf
    • https://uploads.strikinglycdn.com/files/b9e733a1-1d89-4134-8c64-d5f818bb832f/best_free_trx_app.pdf
    • http://femejedad.epizy.com/guide_touristique_finistere_nord.pdf
    • http://gamelaluwer.myartsonline.com/5643281417.pdf
    • http://vowaderisosalel.epizy.com/balovidexadir.pdf
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_23e0cc6d32f340abbfca92b4aa07e80a.pdf?index=true
    • http://zutugidod.onlinewebshop.net/59195917563.pdf
    • http://tufigeburevizi.epizy.com/allianz_ovhc_claim_form.pdf
    • http://josuremase.rf.gd/ibm_x3650_m4_server_guide_windows_2016.pdf
    • https://s3.amazonaws.com/libeganot/54898588349.pdf
    • https://s3.amazonaws.com/mokuwanibof/collections_textbook_answers_grade_7.pdf
    • http://luxupovokajaf.onlinewebshop.net/58305740223.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_off0000cace.bin
820f28e301e8ff8782529ed1a8fe65158c96245ad4ebaa545a63a9da9aec1b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACE 5656 bytes
font_01_sfnt_off0000ddf0.bin
456a748ef106abd6d476cf75d57fa04f33d5d8169f479a062138bc5dfcb30ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 10388 bytes

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