Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85168f13ea6bed8…

MALICIOUS

PDF

71.9 KB Created: 2020-12-18 04:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cb22db0db380d97f76037b432c71fe5f SHA-1: b3ed398f71d97b207c7e9432585a8a3be1b19444 SHA-256: f85168f13ea6bed81796df8c76455545e0b745bd778be036ee10a989c4dd714d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, detected as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://trafftec.ru/strik?utm_term=maine+high+school+basketball+tournament+2019', is embedded directly in the document. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=maine+high+school+basketball+tournament+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366980/normal_5fd07bc955994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_5fc3170273c2d.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/bfedbffc400693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_5fbfc80ed2d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5fa3f008ac852.pdfIn PDF document text
    • https://xavedogaw.weebly.com/uploads/1/3/4/6/134659805/5827352.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487191/normal_5fc4ea5727c05.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/rerinago/xofiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/cambridge_movers_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/cooking_academy_4_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/37145715279.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/new_catholic_encyclopedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bedcd6e-a47d-41d3-83b9-b554cbce742f/70226238685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9693e43-9f11-4219-85a3-5f0f2c0a5e41/58875659540.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/67362610429.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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 5904 bytes
SHA-256: d55ad5fa6fa96896e4d703394143c0ffa19e3d1955d2732f62b8f45c08970a33
font_01_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 10844 bytes
SHA-256: 39e1492283a233a67c0792fbcf578dc3f9011fbd5560d39a71bf36ee52d87a96

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