Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c33091ab73c4a4…

MALICIOUS

PDF

88.9 KB Created: 2021-02-23 01:54:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f723d39a8997a66424c204876e5559d2 SHA-1: 3c83f2af63d84aabf6f27161e696ada62ccb8c76 SHA-256: 05c33091ab73c4a4bd7d2d9ae39615bfea820e648d07e8c550e8395dcc770c01
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing document and a link farm, designed to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack that likely leverages embedded JavaScript to facilitate redirection.

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
  • 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://jacksth.ru/aws?utm_term=scary+stories+to+tell+in+the+dark+rating+uk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457592/normal_5ff10ef59d584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_603412007b136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fe04e7cd0aa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478685/normal_5fcee0e770436.pdfIn PDF document text
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/zizatamew_zuwomoxud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409403/normal_5fe2ca4969bd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373264/normal_5ffacbd8453bc.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/4379686.pdfIn PDF document text
    • https://fuburufogukedez.weebly.com/uploads/1/3/0/7/130776130/simugidedofe.pdfIn PDF document text
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/wixepozo.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/4194136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamupuzif.epizy.com/tewupagef.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/59098774221.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/5766264899.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/48573363759.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_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 5472 bytes
SHA-256: 813ddd7e478dd1695f56bc8602db4f14fef3a88cfd02a7d699b7fb3b76b80283
font_01_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 12048 bytes
SHA-256: 1694b5a7c28c46e3121bb97082c0b71742782bd50118a4ed0a39fa81e086ad43

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