Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43267b8ff24fabc…

MALICIOUS

PDF

39.5 KB Created: 2020-11-07 10:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 478a5f65f6402bc387d7e941cc633f2c SHA-1: 72c532ddcc2800f36119f34155a2000a25e3aff4 SHA-256: e43267b8ff24fabc617f0abd7a55aae52bcf39bb042691b3ca55d34513a36638
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • 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://traffset.ru/aws?keyword=wamsutta+dream+zone+sheets+1000 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5fa5dadaaeef8.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/vejawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f8848b322434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_5f9d9a5e13fa2.pdfIn PDF document text
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/mebuvat-monofutiratume-vomubo-nenogemawusar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vazebaz.files.wordpress.com/2020/11/dowas.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/wenexowulafusugifineke.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/95367366925.pdfIn PDF document text
    • https://s3.amazonaws.com/mazugezijap/leguni.pdfIn PDF document text
    • https://felibule.files.wordpress.com/2020/11/povenowitifebazoduvi.pdfIn PDF document text
    • https://s3.amazonaws.com/padoragog/74768536274.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_off000059d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59D0 5288 bytes
SHA-256: 7b519bed9c4ebb368b87d299ad5bc1c109639fbe4c9fda849504fc20a4a89cc9
font_01_sfnt_off00006bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB7 11040 bytes
SHA-256: 86e54924e30abaf41a02a77dd6e93d1f2bab3f498f64bbcb632c383105f7c37c