Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8a02fdcffc5613…

MALICIOUS

PDF

66.0 KB Created: 2021-02-08 10:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e225a86aee295b5da9cf068b6304657 SHA-1: eb34ea12f6580694cf42de9e97fd846614561d40 SHA-256: cd8a02fdcffc5613f19c79e838f127b68ee78471777be09ce58ccaac6e4ec3b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs suggests it is designed to redirect users to potentially harmful content or further stages of an attack. No scripts were extracted, but the structure and URL distribution are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/aws?utm_term=funeral+invitations+templates+free PDF link annotation
    • http://tegonur.22web.org/25821574444.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/KiaZ4hc/migonifubox.pdfIn PDF document text
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/wazesenekisadaxu.pdfIn PDF document text
    • http://alexsaf.ru/73100640344ddbox.pdfIn PDF document text
    • http://lnstagramoriginal.com/horizon_mobile_village_rv_parktu4p6.pdfIn PDF document text
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/vokuzazokaworixadax.pdfIn PDF document text
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/9a2cf34501581c.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/dovow_xuwurimin_didajuwesa_tudorixilupik.pdfIn PDF document text
    • https://tifalexax.weebly.com/uploads/1/3/4/4/134471923/8529738.pdfIn PDF document text
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/zamamuxolufetev.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/94d68d63830a210.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/6751706.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5ff49f32ce627.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_off0000c826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 5064 bytes
SHA-256: 78a8997ec6423023251fda2f7906bf417f718f3e1c1dbd051e88c8fdb588df63
font_01_sfnt_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 9884 bytes
SHA-256: efa41c51d132f2868522bf5cd4eae6478577ac14cad335913bba8dae04251d58

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