Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca71b23607da8e3…

MALICIOUS

PDF

85.5 KB Created: 2021-03-11 14:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 989e0614ff8b5c0da50c693ebe264764 SHA-1: 5f5df17e389ad45a42ae776a3ab04bc5cb20266c SHA-256: 9ca71b23607da8e344594aa1adc1a4f6cbbda0fd6d5b3600fb40385809f71b80
156 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 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/aws?utm_term=total+gym+setup+manual PDF link annotation
    • http://xofenejilomoz.iblogger.org/belafudavilonafewomofes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fda254e81000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_602d2d5fcbf79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_603d6e2ac0765.pdfIn PDF document text
    • http://wofoweniwer.iblogger.org/sojujuwabokasofom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_600ae81e993c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/44228597707.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/24606805236.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/35647126874.pdfIn PDF document text
    • http://bisegigosos.epizy.com/9221890823.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/aragonite_mineral_information.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_190e2c78d6994d1e8b1384e944e882e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/art_of_seduction_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/convert_jpg_to_excel_spreadsheet.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_cdc04d8a31474cf589ee76e04e9179be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juduk/ielts_writing_task_2_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/32892997356.pdfIn PDF document text
    • http://jebafokar.rf.gd/business_communication_today_14th_edition.pdfIn PDF document text
    • http://guzeberipavol.rf.gd/youth_football_drills_with_pads.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 4928 bytes
SHA-256: 938122baacb90d8e530dd12b38ab45b24f10251c8d008d11b5eee6cfdfc4b3d4
font_01_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 11680 bytes
SHA-256: a8f0c7f690077f58e29978a6c4a974306e97c0de86ba9507220ea5361839b9a6
font_02_sfnt_off00013ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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