Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bcb9e4ebd28f20…

MALICIOUS

PDF

80.2 KB Created: 2021-06-10 03:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5c734a8edb489fcd5103faccb39655cc SHA-1: 2335f7630731b7c974c1a0b091e411d91fa766c7 SHA-256: 87bcb9e4ebd28f20badc392897f7ee282bdeea3bc384d9ef0cef67f926379434
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

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://wastran.ru/pbw?utm_term=sight+word+an+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387813/normal_5fd7a8efe696e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_604ae8a8327e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_601563cca7386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_605d78761aba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_5fe663df5399c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447101/normal_60b7ed25d7359.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383445/normal_6003f2fd36c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5fdc5dcb25189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_60bf7f070e894.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4392237/normal_60aff79c6767e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_601b9adb85654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497353/normal_60c1577d24946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae98114e-f570-49c1-a444-b24102830304/happy_endings_margaret_atwood_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b6fd25-62fa-4c34-8cdc-604584dbd211/63982792736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae2c38f-ef3f-4e07-b3d0-948ddef7cef1/gobefapakusez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14bbb28d-0d6b-4931-bad3-adaef41b2669/clases_de_comunicacion_linguistica_oral_y_escrita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c53e8e-0f76-459d-a94d-74ff656c4e79/rebelin_en_la_granja_personajes_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f043a8-0843-49e9-8023-f2f4b6044be9/stock_market_holidays_20201.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 5316 bytes
SHA-256: d3cc2da5cc1dcfbfc017c2ebfc76891c693656e83feed11f395fe42bc92afbc0
font_01_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 10852 bytes
SHA-256: be571a1a6d2a41a638b0d9a58b66b4e0587808c8e9f5c64cb8811617e08a744a
font_02_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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