Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33e38f28609b82f…

MALICIOUS

PDF

84.9 KB Created: 2021-03-16 20:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a64ab8d9e560378ed522369a2177da3 SHA-1: e27b7987598f8895dc396d0773a4555e7a5013c0 SHA-256: e33e38f28609b82fd5c11924c6cd8f28c480dcd96be161e6f1964d4cc3878483
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URL pointing to a phishing domain, likely intended to deliver a malicious payload or redirect the user to a credential harvesting page. The document body, though heavily obfuscated, suggests a lure related to a 'Cladogram answer key'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=cladogram+answer+key
    • http://tonilakifak.mypressonline.com/auger_mining.pdf
    • https://static.s123-cdn-static.com/uploads/4481163/normal_5fee64497e3fb.pdf
    • https://cdn-cms.f-static.net/uploads/4490725/normal_60395fdcc1a57.pdf
    • http://mamubisuk.mypressonline.com/what_does_4_gram_positive_cocci_mean.pdf
    • http://rebezun.mygamesonline.org/84550765375.pdf
    • http://megidexabaror.mywebcommunity.org/good_romance_books_to_read_for_adults.pdf
    • http://jonotijero.medianewsonline.com/bebixosafolugot.pdf
    • https://lotaximadezepa.weebly.com/uploads/1/3/1/3/131379514/a2ffd1a93bab.pdf
    • http://pemufosapakem.mypressonline.com/canon_mg3520_wireless_setup_iphone.pdf
    • https://static.s123-cdn-static.com/uploads/4412768/normal_5fdf336d9d6a9.pdf
    • http://nunesop.scienceontheweb.net/cash_flow_statement_full_chapter.pdf
    • http://gukiduwonaxinef.getenjoyment.net/82328816791.pdf
    • https://cdn-cms.f-static.net/uploads/4407777/normal_6038d0ce030c2.pdf
    • http://xutefizil.getenjoyment.net/pefosejoboxemejoko.pdf
    • http://fiziwafofekaku.mygamesonline.org/blends_worksheets_for_kindergarten.pdf
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/verul_takugefowod_tuwovibalowe_xokufudub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_aac1f2365815487d9c853b3dc21beb93.pdf?index=true
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_f9a0821f21e04ad7b0f6ba1aa2084eed.pdf?index=true
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_ae193e3836ee47089146f801dc684545.pdf?index=true
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_aa31c1362c844f099aca9e5f472be7d5.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_8cd60117dbc1462daafdc8109efcd6c7.pdf?index=true
    • 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_off00010a74.bin
41d77f291e946a38d04789294329ab4c0417326b2e8124b5a44f3cfde0d2010d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A74 5308 bytes
font_01_sfnt_off00011c84.bin
36a3fd592812ea068502224dac1ec609ea59f905c76f12ff92ccdb887136b88e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 12396 bytes

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