Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c3cacb4302f3bc…

MALICIOUS

PDF

86.6 KB Created: 2021-02-17 22:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 597dfd80fe588b210c068ab5a6c68997 SHA-1: 6f57e673d2442eb446e3dd900df208994d64f28d SHA-256: 07c3cacb4302f3bca074a1e462e06b015ea64458c854c255290227b8e8b5e73a
136 Risk Score

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.
  • 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://jacksth.ru/123?utm_term=quotes+of+foreshadowing+in+the+pit+and+the+pendulum PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454056/normal_5fd79582e3d9e.pdfIn PDF document text
    • http://voirly.xyz/120478337153f1ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409107/normal_5ff95eca4b160.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/xeluke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_5fe6d543cae5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420248/normal_6000ba5e22b1b.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/8169213.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5ff7d353bc368.pdfIn PDF document text
    • http://esportzmlevent.com/mezijijewite0kwq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fed95ae64e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_600cf6381b475.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_6008a24997df4.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/pujinit/togomusaluvekobaveza.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/51182854051.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/sosibetogopojalogugux.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_off000115ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EF 5608 bytes
SHA-256: a259d486bdf3c8edbc662ebd600a6ac9bdb01721ee92c7e664b2a6a71afd14e9
font_01_sfnt_off000128ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EE 10664 bytes
SHA-256: fe8b64567af4fb7dff1e7301ed76e596c35fff6b6735d8400c14f47d40948748