Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded0e2a4b718a681…

MALICIOUS

PDF

67.8 KB Created: 2020-12-24 01:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f5e20847d7eb8d369304c3279515204e SHA-1: 41ef1728a4c0244bebe013e6ee188c59922e3dc1 SHA-256: ded0e2a4b718a68137c99bd7658743ab41b30ffe2295ffbfa26df332447b0ba0
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 embedded external links, a technique often used for SEO spam or to redirect users to phishing sites. The 'PDF_SEO_LINK_FARM' heuristic specifically flags this behavior. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely related to redirecting users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=police+officer+costume+plus+size PDF link annotation
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/bcb576e4.pdfIn PDF document text
    • https://cdn.sqhk.co/gozolosew/6jhrG0N/yousician_an_award_winning_music_education_app.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/bfdb25c6-89d7-443e-9456-2e8f127334ae/laxuwodorugulug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65802105-4e94-4070-8c49-17b04bc5dc49/tuzowezewakoguvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13d6187-de3a-4d8b-bb00-5b3c19e36e06/convert_presentation_to_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/73709276463.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/nigarovivujewebowiwem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf930d9-ad72-4982-b137-626a0e8f61fb/18032039577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7584b48c-5e5a-4c86-b053-4679c6657ac3/29960297928.pdfIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/plastic_spiked_chastity.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_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 5004 bytes
SHA-256: b12577b01ea08a48ebf522880372e6804c29e11d5167e20ef3632e31010d2260
font_01_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 10460 bytes
SHA-256: 12f3ddb34b96d14e335205c333f3f09236f0de2068373be71077f1e9730d1fc2

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