Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bc629429e3b5c5…

MALICIOUS

PDF

39.9 KB Created: 2020-11-07 06:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 875e28ae9ebce093d7e916be4e395fb8 SHA-1: 396446d2de2bb05b8da7fe0bc4a297cbbbeeb591 SHA-256: b8bc629429e3b5c5f2ed8d24c01912634a3b52e294d7ae867fb7b84d77215af4
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://trafffi.ru/aws?keyword=presidency+definition+college+admission+2020 PDF link annotation
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/xesijibezipu-kutatajoduzijiz.pdfIn PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/mekixojudapipo.pdfIn PDF document text
    • https://mipumitazolepi.weebly.com/uploads/1/3/4/4/134495795/pokuzusekurox-sikojudi.pdfIn PDF document text
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/8868866.pdfIn 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/44650b80-2b96-4598-9fb0-18b3512b3f32/pefakojitidilalagevomo.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/90634236303.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/63313540323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00efea1d-f652-4691-8a61-c5555eaa870b/bajigafezumalapebag.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/47347069565.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/nurova.pdfIn PDF document text
    • https://s3.amazonaws.com/mitakajazum/divergent_full_movie_watch_online_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/39671302411.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/83699145666.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_off00005dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC9 5720 bytes
SHA-256: 8e15d6e123cadf9959a9fa4ca67077e553e2f502f7d5482397122176ef298638
font_01_sfnt_off00007135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7135 9888 bytes
SHA-256: ca500d067fec85becc49b734d5d7e7afa90ca968d1a481e4f3c2543b87571ef7