Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d533ba8af53fa3…

MALICIOUS

PDF

75.3 KB Created: 2021-03-04 07:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e3f1cb2d08ae8c0f71b8ed12466767d0 SHA-1: c46e6898cdff6fe414847c67da0cfa3a70a192cb SHA-256: d4d533ba8af53fa340c8c82ca8634bc62c76b971f2b852efa36b10ff2bc7706a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many with numeric or generic slugs, indicative of a link farm designed to distribute malware or phish users. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. The presence of multiple PDF files in the URLs suggests a chain of redirection or a collection of malicious documents. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://gimoguvi.ru/123?utm_term=sony+ericsson+mw600+bluetooth+headset+driver+for+windows+7 PDF link annotation
    • http://jixusigelabewe.iblogger.org/cashwagon_apk_terbaru.pdfIn PDF document text
    • https://tapuwapefozex.weebly.com/uploads/1/3/4/3/134350869/firufusogufar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478393/normal_5fcd704bc1887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474979/normal_5fe0cf28aca14.pdfIn PDF document text
    • https://gemajoxow.weebly.com/uploads/1/3/4/7/134721961/9529668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427498/normal_6008ff1831964.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/04f16df41a.pdfIn PDF document text
    • http://palefazorubo.22web.org/85118302550.pdfIn PDF document text
    • https://cdn.sqhk.co/tulotunofuz/0ig0oJE/25478412237.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/6iemXIN/48219849792.pdfIn PDF document text
    • https://dexulivixuwe.weebly.com/uploads/1/3/0/7/130739852/d4561.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409395/normal_6000adb06c5c6.pdfIn PDF document text
    • https://cdn.sqhk.co/darojopul/fgPhgFZ/jonuzijiru.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/nYJidaM/.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 6136 bytes
SHA-256: d836dc9f129c7e180950fd83aec1518919f0c664b9361439d82bc50523218677
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 12604 bytes
SHA-256: 97fc1722d139765043eb29db92f2f28be5da20b074b60af260414284fe9bb339

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