Malicious PDF — malware analysis report

Static analysis result for SHA-256 7671636219b897d2…

MALICIOUS

PDF

68.7 KB Created: 2020-11-14 12:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bad1ef28430b7c66be4e9ac9f0a60906 SHA-1: dee0a797ccfef665b551e3d70aedb9ed66d52bd0 SHA-256: 7671636219b897d20b1e02122e7331f600ab4fc08834c2abcda5e486f0ee466b
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-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://trafffi.ru/123?utm_term=centra+college+of+nursing+dean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417653/normal_5faf45a79f09f.pdfIn PDF document text
    • https://buvejigu.weebly.com/uploads/1/3/4/3/134386374/2043672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f8b3ac095108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5fa1447d581b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5f8ddd9b9c02a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5faf58e4099f6.pdfIn PDF document text
    • https://lavigepes.weebly.com/uploads/1/3/4/4/134437347/buxabijibad-torareju-litojigup.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.pdfIn PDF document text
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/3992186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_5f8f03553ff12.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7007845.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/e87fe449-80d1-4b3a-a429-348ce4ddeb43/losemozafela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82a508a-73f1-468f-9698-1e1f434ff5c3/ncdpi_math_standards_1st_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c57fb31-ff5b-4b15-8400-32da39e4ebb1/62632308484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9c3f85-d8a3-4645-8117-2b450e20e41a/78986376200.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_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 5092 bytes
SHA-256: 68552be5e11e13ecd672d27897b277a542d1bd5dbcf1a0c5fa62ea635cc2bc1d
font_01_sfnt_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 10796 bytes
SHA-256: 415b1cca589c73d141b63e1e018d50420e1255965d00452a5d48f6c4e3579871

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