Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad49f2ad8a3dc7f…

MALICIOUS

PDF

80.1 KB Created: 2021-03-05 05:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9640188ea710d56fd6b9b808ef357bd4 SHA-1: c78bbefe6a0129d5ff7a3b4c520771b386bf2897 SHA-256: 4ad49f2ad8a3dc7f73a5982015e61a11849960793df2ca95f781afe6aa84914f
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://vilenefex.ru/123?utm_term=what+are+the+objectives+of+employee+appraisal PDF link annotation
    • https://cdn.sqhk.co/zebusukef/jbjcwLl/mufikixuwuwumum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_5fe45775a2065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_5fdb33af1b56d.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/mjihdzb/tennessee_titans_coronavirus_news.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450870/normal_5ff913a88f6cd.pdfIn PDF document text
    • https://cdn.sqhk.co/kidimezamos/KijXxic/evacuees_meaning_in_bengali.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/blidahd/the_soul_collector_2020_ending_explained.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/command-_line_reference_a-_z.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/jirubojaxaroxenitirumuxet.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_f291a9a4f9af48209bf7f46a9ddf848e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/adoration_brenton_brown_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee94a742-f9b0-4344-a2f9-47b5d60c06e8/verodunoka.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/amc_10_2018_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7e0efe-0346-443f-a189-e2c4517d9fe0/grammaire_franaise_download.pdfIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_49d2404277124ae8915b45c3c1a326ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/kinakeliwawolew.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_8099e3aa766c4b91bca47ace1f19f483.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/40064902396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d58c25-2c79-4656-9227-96528e6f2bfd/criminal_lawyers_in_okc.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_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 5644 bytes
SHA-256: 4f69bf1b7a1ff885852bdaddf941bb5c212897747a66a34a975bebaca1f3ed02
font_01_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 11016 bytes
SHA-256: fdd9fe74d2fe5c70d6776407a75bc67f731af5eb99eaa1e86af3f288c36e1de2

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