Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa0bd19fb141c3a…

MALICIOUS

PDF

64.3 KB Created: 2021-02-22 09:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b640edeb74900bb7e7b97b79e77ede74 SHA-1: 684b247b09f399f4ea33a20b8e34662265731b5e SHA-256: caa0bd19fb141c3a2b419390b652558e030931f0ff9cc1ef1080fb0922333577
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that masquerades as a physics worksheet, likely to trick the user into visiting a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to potentially malicious content.

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://bologen.ru/wix?keyword=physics+momentum%252Fimpulse+worksheet+chapter+6
    • http://itravelgr.com/bipuvatafoevn4u.pdf
    • https://cdn.sqhk.co/mitugejaxel/VUajiJz/nedujowuzazonot.pdf
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/34078.pdf
    • http://dimax-matrasy.ru/a_thousand_splendid_suns_symbols_and_motifszsx36.pdf
    • https://cdn.sqhk.co/molipigi/ejc6hbl/20737780682.pdf
    • http://wexoxunesixu.iblogger.org/lebigitilolidos.pdf
    • http://rm-swis-mine.com/75669244983uc3v1.pdf
    • https://cdn.sqhk.co/dutudovajud/2dhiChe/wiwefixerobutovoji.pdf
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/6506858.pdf
    • https://limowidijepa.weebly.com/uploads/1/3/5/9/135992559/mubono.pdf
    • http://help-mediasupport.com/196118955386di60.pdf
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/5676473.pdf
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/fomigitobani.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nakepusigazu.epizy.com/1998_buick_riviera_performance_parts.pdf
    • http://mujujum.epizy.com/naruto_blazing_ninja_road_18_guide.pdf
    • http://jinufezep.epizy.com/39156487189.pdf
    • http://zubeleboju.epizy.com/wilaxivoletafulab.pdf
    • http://nedudumitariz.epizy.com/zenopabejemokalufuwuduluf.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_off0000beec.bin
92a9efaa4b52bb4f0c04ec38417eb782dfff3288a75da4a89ff796b0f761179d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEC 5620 bytes
font_01_sfnt_off0000d201.bin
c2480add550a969f5ae59e2a22bbc56093d2d6dce03c6d36605879ab847399a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 9804 bytes

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