Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ae3526681bf5dd…

MALICIOUS

PDF

82.5 KB Created: 2021-03-29 17:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee8a785204922fc3a15fff38b83357c1 SHA-1: 6949ef2add526f549d0c56fd07222e746684aecd SHA-256: 21ae3526681bf5dd77522e21feedc89aac3ff3f377f647588b099147793ba8b8
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a malicious domain, disguised as a document about Herman Bavinck books. ClamAV and ML classifiers strongly indicate maliciousness, consistent with a phishing lure. No scripts were extracted, but the presence of external URIs and the overall detection profile suggest a phishing attempt to redirect users to a malicious site.

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://jacksth.ru/award?keyword=herman+bavinck+books+pdf
    • http://runatem.66ghz.com/crazy_gnarls_barkley_sheet_music.pdf
    • https://cdn-cms.f-static.net/uploads/4367632/normal_6040457c282f2.pdf
    • https://static.s123-cdn-static.com/uploads/4488837/normal_5fee35a74a3ab.pdf
    • https://static.s123-cdn-static.com/uploads/4453144/normal_5fed3a6c79dce.pdf
    • https://cdn-cms.f-static.net/uploads/4469350/normal_5fd7f9966e6d3.pdf
    • https://static.s123-cdn-static.com/uploads/4404310/normal_5ff08f42c0dcb.pdf
    • https://cdn-cms.f-static.net/uploads/4377909/normal_6025e4a62b022.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kuzibawo.rf.gd/62771047495.pdf
    • http://danofef.rf.gd/bosubanokulibozuv.pdf
    • https://uploads.strikinglycdn.com/files/21401f44-4faa-425e-895a-8d2ef373c49f/what_type_of_syrup_does_dunkin_donuts_use.pdf
    • http://wuvasof.epizy.com/ssc_stenographer_online_form_2020.pdf
    • https://uploads.strikinglycdn.com/files/d3d3a49e-2593-44e3-9b32-90dbb7cd4fbe/fimajatewumudemopatu.pdf
    • http://filivuso.rf.gd/11615628540.pdf
    • https://s3.amazonaws.com/bawalidamovidud/6_square_comic_strip_template.pdf
    • https://uploads.strikinglycdn.com/files/48c7c39c-92f7-43f5-96ec-1a467b551010/lord_of_the_flies_guided_reading_questions_chapter_5_answers.pdf
    • http://sumidemeg.epizy.com/performance_macbook_air_2019.pdf
    • http://semiwexojexudu.epizy.com/a_connecticut_yankee_in_king_arthurs_court_chapter_15_summary.pdf
    • https://s3.amazonaws.com/badodemebo/destination_b1_teacher_s_book.pdf
    • https://s3.amazonaws.com/wunupalezozerud/technical_report_writing_course_outline.pdf
    • http://danetuxu.rf.gd/59751448279.pdf
    • https://uploads.strikinglycdn.com/files/aca0a151-ec1f-4dab-a5a8-bc5987eb226a/14570962458.pdf
    • https://uploads.strikinglycdn.com/files/6a3160c1-bc7d-4f12-8ae2-29c12919091b/tiguwolo.pdf
    • http://dunuruzofugavix.rf.gd/87699843186.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_off0001046b.bin
b4804704bedbf1a43ff74fbee64ac9c824e5ce803be29fdc2057a6ea213224b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 5492 bytes
font_01_sfnt_off00011704.bin
3938439766fd1bca624a1d51a0e3ac4bcb8cc6ee1d06b5ed6df4a30c4e37b7b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 11360 bytes

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