Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fbe95787ed5ad5…

MALICIOUS

PDF

41.1 KB Created: 2020-10-05 07:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 533bb5f55c8da88c14036fd8509e06c0 SHA-1: 22916a2c56d488ec2a6eee130cd925821eac2013 SHA-256: 39fbe95787ed5ad50d480880b677c69b24be0161a05f71af271c7ab6c126cd82
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/strik?keyword=johnny+joestar+outfit In PDF document text
    • http://zarupiv.vincentsgermanshepherds.com/uploads/1/3/2/3/132302868/2926444.pdfIn PDF document text
    • http://jabil.lauracrowephotography.com/uploads/1/3/2/6/132681308/nupewowawuf.pdfIn PDF document text
    • http://gerifawo.cypish.org/uploads/1/3/1/4/131406893/1028151.pdfIn PDF document text
    • http://files.smyrnabaptistchurch.org/uploads/1/3/1/8/131856158/mifoluraf_weporebek_dibigugujebi.pdfIn PDF document text
    • http://jasud.wazeechachurch.com/uploads/1/3/1/4/131454807/f1045d.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/bbee1308-ffe9-42d1-be6c-d27a9cdf3d35/73758266460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7188586e-b3e4-4f3f-bdb3-9e01f2fb20ef/weruwenutakogela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/152f50f5-9ec2-46e0-ae36-ad5c4dae2f16/bajenuraridenorevoxejubok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/036c1e30-002c-4d55-a1b3-8b713247f703/88555426021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aeeb270-6e2d-4063-973f-7655f1b3e1b6/87503184227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d26d149-75fc-4504-9db3-ce7597644f91/pekesagetupixasepikurukad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1e40ce-73db-4bfa-b72f-e1d646f28f09/15117731739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2951eb0-dd54-47c5-82b7-e61dabf6279f/vojoxexuzuserivafajubul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1df1a7f-5be9-44cf-98bd-3b98562ad21a/2138712054.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_off00005776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5776 4988 bytes
SHA-256: 8bed863ea778e6aef05a413c33e3ea82e52b328469ac27373016af97ae6224eb
font_01_sfnt_off00006873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6873 14544 bytes
SHA-256: a8ced100041fc67d31f4413d9ed66971b6ef21313606bd475d68fe0431f6f85a

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