Malicious PDF — malware analysis report

Static analysis result for SHA-256 67333dcfa3fb2884…

MALICIOUS

PDF

72.4 KB Created: 2021-03-06 02:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 44477e230dddd860193f2140be918d0b SHA-1: d45d4a331ebc958909fa531b08a4d4451b0f82bc SHA-256: 67333dcfa3fb28848da4eff244e4e3f4d54cb9bcd131fe82507e42c37971f69b
156 Risk Score

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 a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=8th+grade+math+probability+worksheets+pdf PDF link annotation
    • http://xexogafuko.22web.org/wulobadexifura.pdfIn PDF document text
    • https://sazopugewado.weebly.com/uploads/1/3/1/4/131453094/5606487.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/c789e9e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_9d619bec4c66457e897b18ab1cb2718d.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_d8b8ff60fabe46658814c7920cc28bbc.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_ab8635be9c0f404b81e3c8d4f964bf30.pdf?index=trueIn PDF document text
    • http://sugexure.rf.gd/how_to_reach_al_akir_platform.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_35e2aa745a8841fda325d314ff61bc7a.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_711f57f4c3d149d6b2c2d33e8a9656e4.pdf?index=trueIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_2b82956b15884f708f13e9173a066bbd.pdf?index=trueIn PDF document text
    • http://nolagevupuxuje.epizy.com/vapavabepurime.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/cavapoo_dog_breed_information.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/cagr_calculation_excel_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/pathophysiology_of_sepsis_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/wodumunatilerepigimabonir.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/android_accessibility_api.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/beaver_lake_fishing_report_arkansas.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/41649011033.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 5952 bytes
SHA-256: b70f42856e0696ed9af902805add085a6ea092665f9c524a0baca5cfdae4414e
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 11072 bytes
SHA-256: 4f4a01a6917236d7ae89df45ba0b956168500a3a8d23c233e29c360e10955b82

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