Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd633457cd446d24…

MALICIOUS

PDF

90.3 KB Created: 2020-11-11 09:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e6fe2dc80412edc91075a893fe0c2542 SHA-1: 76f7c6c9b7f6fe908942c1601f32a9ca78fbf306 SHA-256: dd633457cd446d249b8aefbb6b337c801ff4a9f4f119002bc773ff9a387aa9cf
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identified a large number of external PDF links, suggesting a link farm. ClamAV also detected the file as Pdf.Phishing.Trojan-d2568dad23a94d95. The presence of these malicious links and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?keyword=beavis+and+butthead+voice+actor In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_5f99bbd727f29.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/sekenamotewunat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_5f982acb4563e.pdfIn PDF document text
    • https://wazemuguv.weebly.com/uploads/1/3/4/4/134489137/metirijobuxof.pdfIn PDF document text
    • https://morekifozolil.weebly.com/uploads/1/3/4/3/134332894/numazip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_5f9a81b939ad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388173/normal_5f979765a28fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_5fa81b692389d.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/jezebojogavabiruk.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/tadexafudidaluwuraw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_5fa6c8e818417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f87058890749.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/lopazura/doluzidoxa.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_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 5244 bytes
SHA-256: b44fd867ac82b6f4dddf77c5f88290d0a83a74623f5842a18afa9a94dec6f541
font_01_sfnt_off00013496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13496 11704 bytes
SHA-256: a91ef1a0a934d47dbfbcd7c138677ab910326c17567ada2bff744d616d1f34b6

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