Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9408422b2ec50d…

MALICIOUS

PDF

65.4 KB Created: 2020-10-31 03:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 8c5f8b87498a05a70b622bf392988f17 SHA-1: 579163449a617443a83b5861cd51a140a28eb928 SHA-256: 3b9408422b2ec50d4863becf7e59f5c178f7f3daf62f57aef245862bf5fb800d
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/aws?keyword=cronograma+de+actividades+en+excel In PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/jadixirutoxe.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.pdfIn PDF document text
    • https://gawugabel.weebly.com/uploads/1/3/4/3/134361726/561328.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/wijiliso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_5f93ac2cbe9a1.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c288bb-4a30-4644-845a-218f112576db/10707349218.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/air_conditioner_maintenance_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d772377-ee25-4cb8-933d-e00a2ccff468/mudilorabivugezibunosewir.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/como_sumar_fracciones_con_enteros.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/savimiromibaso.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/74575411928.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/98507179505.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/60722048034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edf4b2f-f630-4fda-b865-a952af7f1505/jotokomamobagujazukibixel.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2C2 1724 bytes
SHA-256: 36a53b3ff9c8c07440ff8ce1e1da3cb698ed8e4ffb410b07f342c197cba38e94
font_01_sfnt_off0000ab1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1C 5292 bytes
SHA-256: 089ea601eac0cc050b05c2f81b168d0107b2e1872c97a0643991a7b9757e3965
font_02_sfnt_off0000bd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0B 11836 bytes
SHA-256: 9c07f9de0aef057d303d12c51b62bfd1bb77b6f0f5efbeaf249e82ce58a2e1a6
font_03_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210

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