Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eecf78e3882ea80…

MALICIOUS

PDF

77.2 KB Created: 2021-02-24 11:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 66de6956449bffe38d30e4c59996d912 SHA-1: 2d9313c9626f5acc6711d7e925c5d34aa10f1921 SHA-256: 0eecf78e3882ea80876e38a281c3ad766f179ec5e151965935ce58829f7aa390
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful websites.

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://leonvi.ru/123?utm_term=how+to+make+a+clock+step+by+step PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5ff4ea9f5aed9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490269/normal_5ffe7f744f8ee.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/hja66ie/definition_distribution_de_flyers.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/jonafijom.pdfIn PDF document text
    • https://kuvobawodamelis.weebly.com/uploads/1/3/5/3/135350379/8321572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477367/normal_602dcccab3d26.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/fuzane.pdfIn PDF document text
    • http://usesol.xyz/real_world_quadratic_equations_worksheetqejyv.pdfIn PDF document text
    • http://stassikorskyi.com/silajexebowuwufewug6l96n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5ff5fbcfb0e54.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/8996101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_602da0a18babd.pdfIn PDF document text
    • http://rebituzugofebo.22web.org/juzunasoxife.pdfIn PDF document text
    • http://wopazav.22web.org/15666549181.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/voropa/45276575311.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/22677957032.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/buxesiv.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/98211474029.pdfIn PDF document text
    • http://wubogijogazerew.epizy.com/bevusekakodigunifidegol.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_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 5344 bytes
SHA-256: 54a81c326d7f79e00c28bded3ea10a64b42953a79a2620a1f447b9b04dd04cfb
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 11160 bytes
SHA-256: be3fb9969eea97a1c50495ed6465b38817a5a1a36edcc032f79a1cb616327169

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