Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb32876fa23b2b3…

MALICIOUS

PDF

73.0 KB Created: 2021-01-05 21:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b0d89a6b5f72d0af15dc46047cba8c46 SHA-1: 75054a0b29a4332f40fd9cf489c2a8fbedab35ff SHA-256: 5bb32876fa23b2b33ceb4a4565dc98f37ae7bc802832230e8a73e46ab54e48a9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, a technique often used for SEO manipulation or to direct users to phishing sites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it's designed to redirect users, potentially as part of a phishing campaign or to distribute further malware.

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/aws?utm_term=cardinal+newman+sixth+form+college+brighton PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5f99e6e3f2ff8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483338/normal_5fee1f17bbd47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5fbd7e3fd2ade.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/YWiUJc8/fevurukokofebesolawebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460954/normal_5fd153d23f365.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/2a2e97f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412780/normal_5fe2aeafd7a5f.pdfIn PDF document text
    • https://cdn.sqhk.co/jememobak/fvKd3hj/call_of_duty_warzone_requirements_minimum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5f8890b250f06.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/jixerubowi/amazon_alexa_app_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/lufuwemena.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_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 5640 bytes
SHA-256: 44a6fc78e4cb4a97020c77be3aa2989b6c1ba50211d68c4d72e943ef162686e3
font_01_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 12228 bytes
SHA-256: a9ccfb9560a4da4d6cc68216ea2168d5da9e5b61b2620e7546616ed075aef4dd

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