Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c37a1c460c221ad…

MALICIOUS

PDF

88.2 KB Created: 2020-12-24 03:07:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9f93070a6e148ec32567c0ffe3b1734d SHA-1: dfef667e4762abe8f7ccb7a4d9d0cd84fd7e00fe SHA-256: 8c37a1c460c221ad279ec92ec04c201db0cf3894acb50ef4569c6f7a286b4eaa
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 0.9997

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://trafftec.ru/123?utm_term=what+port+does+vsphere+client+use PDF link annotation
    • https://rewudorabemomaf.weebly.com/uploads/1/3/4/2/134234845/mujisorovopor-kugezuzin.pdfIn PDF document text
    • https://cdn.sqhk.co/bodovukig/W1OyVhi/33516692563.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/vozutefirudeji.pdfIn PDF document text
    • https://zomijozefabeten.weebly.com/uploads/1/3/4/6/134636393/gizepukevowo.pdfIn PDF document text
    • https://cdn.sqhk.co/mapigusene/I6ogdjd/84628673914.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/c516772c-971e-4021-b569-b1c4c2b34a5e/manatee_county_notice_of_commencement_filings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769f5c9f-11fd-4dab-8d4f-5915b568c456/42062344880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da5d53e-8015-4cfd-8491-8648857c6fc6/tsunami_worksheet_ks3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aed48a5-1a6a-4e9a-bc61-9e87a3ce4c9b/67819153451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdea0a3b-5956-48a9-87da-ba1e92353e10/peoplesoft_dc_government_employees.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/vegas_pro_13_serial_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e09dc1a-2567-4bf9-88ee-44fcbd2d6fd6/97443673184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d09b12-60aa-4ffd-8713-5c6ca6f0a0b6/35128164057.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_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 5232 bytes
SHA-256: fa4ee2bfbb66327611781e2bdf3115fbc19af4aadfa67f4caf2297c5a23edc7d
font_01_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 15484 bytes
SHA-256: 18a46650e41dd560780d8f36696aa8f1cda701bc0b027a2f8c8d426e07c8994f

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