Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c5ed0371475291…

MALICIOUS

PDF

94.9 KB Created: 2021-03-13 21:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: af3111b8dc43e95b41a327751ce68793 SHA-1: 109cb4e8c80585f074fa6cd896fae54e730646f2 SHA-256: b9c5ed0371475291dae7cfb5517fe57c1f280befede853fa31444593ea27defc
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 0.9996

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://xezojetit.ru/award?keyword=simple+java+projects+for+students+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466143/normal_5fce66c175fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_6019210abd648.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5ffe16ff780d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_604a89eb71be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5fe73a78ec4d5.pdfIn PDF document text
    • https://moxudoged.weebly.com/uploads/1/3/3/9/133999753/229271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_5fda5e14007a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_6015fcfa1f553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_600ecaff58fbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411490/normal_5fcb2d139d3cb.pdfIn PDF document text
    • https://ziwirekow.weebly.com/uploads/1/3/4/5/134529616/buvorukamudej.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/vuterijoze/66902537418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81cfa9e6-c65b-43bc-8a48-bbbf23da74c7/garelli_supersport_xl.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/goretavimabejuk.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/bapireforigigaguliken.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/copper_sheet_gasket_material.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603be0c8-32bf-4ec8-b906-76cd0fb76fc0/fonepesutitutumafujoviru.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/3118889000.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/88815929452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59779088-437d-497b-a0cb-d51dd55c05d0/90989782797.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/functional_iron_deficiency_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92933a90-1f38-40b7-9143-e34bc825ded8/what_is_medical_claims_proration_system.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_off000134c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C1 5540 bytes
SHA-256: 4dd6fa5ae01739e0a7dc782b5e9fa2d12cbab4d1e30554003f3ff4e11c6e3c10
font_01_sfnt_off00014789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14789 11556 bytes
SHA-256: 16bf1ffac9e28214c2ac9045df599b05cc13bbd7ced19460437e03bd8d703a15

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