Malicious PDF — malware analysis report

Static analysis result for SHA-256 597d7ce01b28e653…

MALICIOUS

PDF

85.8 KB Created: 2021-03-23 10:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 810a2b449c67fa38c20308409ebec7cb SHA-1: 7e699cf4fc9a4e3ea07e3c9e0d56470653d83cd3 SHA-256: 597d7ce01b28e6537ea8ea18be82878165532a63101315f8304ade4096202d5f
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with the primary one being 'https://vilenefex.ru/123?utm_term=sound+amplifier+software+for+pc+free', suggesting a lure for users seeking free software. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to redirect users to potentially harmful sites, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/123?utm_term=sound+amplifier+software+for+pc+free
    • http://jevafurevozu.mygamesonline.org/using_a_and_an_worksheets_for_kindergarten.pdf
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5fcb1e1158831.pdf
    • http://vashe-zdorovie.xyz/hp_elite_7500_mt_specifications3f5hg.pdf
    • https://cdn-cms.f-static.net/uploads/4393761/normal_601653a7ee902.pdf
    • http://maxobujixeweden.sportsontheweb.net/59211615961.pdf
    • http://magicwoolshop.com/what_is_external_structure6fcff.pdf
    • https://static.s123-cdn-static.com/uploads/4407733/normal_5fc7e1845a840.pdf
    • http://qqkaxes.xyz/how_to_forgive_others_and_move_onpndy6.pdf
    • http://zawopim.mygamesonline.org/66328098150.pdf
    • https://cdn-cms.f-static.net/uploads/4409244/normal_6009b88453e67.pdf
    • https://cdn-cms.f-static.net/uploads/4380380/normal_6046e8b4960ca.pdf
    • https://cdn-cms.f-static.net/uploads/4385010/normal_6054335adfe6b.pdf
    • https://cdn.sqhk.co/wufevinek/i9hi8jb/28893218168.pdf
    • https://cdn-cms.f-static.net/uploads/4461250/normal_6043201fa7ffd.pdf
    • https://cdn.sqhk.co/wetiniwem/iLuAr7m/dispute_something_on_credit_report_experian.pdf
    • https://cdn.sqhk.co/dakuwuwuzije/phaZErA/67017677964.pdf
    • https://cdn.sqhk.co/riwifesineji/ejhKspi/99743670807.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/837269fc-8776-4c99-abd4-6bf29ddbf13d/17261367996.pdf
    • http://bagugexasorip.myartsonline.com/bundle_of_joy_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/9edba23c-e115-4b6e-b7f0-4131ba9c799b/86611248761.pdf
    • https://uploads.strikinglycdn.com/files/d981b5b7-80b7-4697-a7da-65dc32036e03/cub_scout_book_wolf.pdf
    • https://uploads.strikinglycdn.com/files/769592bb-f39f-4f9c-9085-989fd7709783/kofijog.pdf
    • https://uploads.strikinglycdn.com/files/6b75a0bd-4f45-49f2-ae57-52ed3fe727d8/36587779652.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010373.bin
51693f02ae21c3fb360b9d5345fe8113445235a35e906b137f7676cd73d14a9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 5376 bytes
font_01_sfnt_off000115b0.bin
8c892efa64071ed2ff5c133ca213588f3451260833529648b9789fb19ff29de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 11240 bytes
font_02_sfnt_off00013b6e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6E 4324 bytes

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