Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c869f00bafc575…

MALICIOUS

PDF

78.0 KB Created: 2021-03-17 17:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c43b76c15dfd7227314c216691f20cb SHA-1: 7736680f9bd93d5e9562936a76a05d625c7173cc SHA-256: d3c869f00bafc575793e4c6594f582235f4575916d568859395f3081c4434b87
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. Heuristics indicate the presence of external URIs and a ML classifier flagged the PDF as malicious, consistent with phishing attempts. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, appears to contain product-related keywords, suggesting a lure for a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=hepa+filter+irobot+roomba+880
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5fd0d67f7e8f5.pdf
    • https://cdn-cms.f-static.net/uploads/4413228/normal_6027f82da0ef9.pdf
    • https://static.s123-cdn-static.com/uploads/4481052/normal_5fe56a1ed8eb8.pdf
    • http://sodahq.pro/10891299360gy53f.pdf
    • https://cdn-cms.f-static.net/uploads/4369664/normal_60111a71848fd.pdf
    • http://cardio-active.site/subedigujamuzufoxurd8ye7.pdf
    • https://cdn-cms.f-static.net/uploads/4501804/normal_603ee783b08a2.pdf
    • https://cdn-cms.f-static.net/uploads/4413967/normal_603ded8264099.pdf
    • https://static.s123-cdn-static.com/uploads/4414848/normal_6003953c17039.pdf
    • http://politach.com/livusutoloravumefelasektmscn.pdf
    • http://all-gopro.com/mechanical_engineering_fresher_salary_in_dubaio24ym.pdf
    • http://igcopyrightforhelps.com/difference_between_bose_companion_2_and_201kxtq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/41a76522-42bc-4859-a5a2-8e9a7a456f2f/exalted_2e_backgrounds.pdf
    • https://uploads.strikinglycdn.com/files/d46fb4a0-c9de-4b66-94c0-500b72bb7115/dokedekedajafisojujik.pdf
    • https://uploads.strikinglycdn.com/files/a57773e6-6e9c-41fa-8065-2d1ed8e93228/40697402108.pdf
    • https://uploads.strikinglycdn.com/files/e1887922-02de-49a5-89df-9e58b4deb94c/ue_boom_3_waterproof_bluetooth_speaker_with_charging_dock.pdf
    • https://uploads.strikinglycdn.com/files/572ec067-2236-4a2c-8c12-d1ebce086d35/61457847996.pdf
    • https://uploads.strikinglycdn.com/files/ce3e6272-1505-46a4-810a-2b8eefcf3158/nordictrack_commercial_1300_elliptical_repair.pdf
    • https://uploads.strikinglycdn.com/files/7fc570c9-ae4a-46de-8ac1-d3370d167779/advanced_excel_reporting_for_management_accountants_free_download.pdf
    • https://uploads.strikinglycdn.com/files/dfd6fb98-5eec-472c-b69b-b5e0b447cbbd/fujewagatikasamibaw.pdf
    • https://uploads.strikinglycdn.com/files/356211c4-48ca-44ca-8ad7-77632d3e18f8/how_to_setup_a_fly_rod_for_trout.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_off0000e723.bin
4c688c0676da4c9c3f1d636d29496b85ed1f90b4285ee9b780884cc7de0e34ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 2960 bytes
font_01_sfnt_off0000f193.bin
16094c21e732ea43b565fbf1a88daf6926468ab62f66f1211159db53a49c71c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 5304 bytes
font_02_sfnt_off00010380.bin
6bef87bc5814e9cebc0caa8ddab37036edd60373420a6355a5f761b2c5b8004b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 11272 bytes

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