Malicious PDF — malware analysis report

Static analysis result for SHA-256 06304b55b74cde08…

MALICIOUS

PDF

71.7 KB Created: 2020-11-25 12:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: feb546894eebeb5bd677374bd2276b0b SHA-1: 90b4f7538e2d0c47ae776873212dde39ad2c71f0 SHA-256: 06304b55b74cde08c1cd44531c419eabd1aeb252baf1df92478c69602e44b89d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document, likely delivered as a spearphishing attachment, designed to redirect users to potentially harmful sites.

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://trafficel.ru/strik?utm_term=what+is+an+orbital+jigsaw PDF link annotation
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/xaxopobavami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_5faa703635c19.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/9565995.pdfIn PDF document text
    • https://kaxokotul.weebly.com/uploads/1/3/4/3/134380066/7eb2ba91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f879bfe9c19d.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/9ba3df3a-e935-4d75-800c-b5b093a0ef88/fokiporekojuposegum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ad26c0-dc1e-452e-9103-0b1e445f4279/things_that_matter_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720e9121-42b6-46df-80bc-a9d1f86531e0/elements_of_music_vf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ae27ea-41ff-4b4c-a417-4b68d490aad9/contemporary_auditing_10th_edition_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760cbbf7-1712-4105-9f27-463310931ad0/feather_earring_template_cricut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a448545a-ac39-42b0-b211-c26bbad1dea5/vikeku.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_off0000dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 5268 bytes
SHA-256: c21e04ae93132d1cdd7bb91012165a4a474d6c2f16891a0c437ce454da3d389d
font_01_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 10424 bytes
SHA-256: bf07837c12b14ee2ad56f39ee7027e78b9c3504fa274f2faf2da818a91eeab66

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