Malicious PDF — malware analysis report

Static analysis result for SHA-256 f429c75b781a5d7e…

MALICIOUS

PDF

43.3 KB Created: 2020-10-15 18:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 2158040d6945c0259995e0b582cfd204 SHA-1: 7de4a4def6429122f6425970a531e0c6bdcf88e9 SHA-256: f429c75b781a5d7e7d8d2879e5483099168ae354bd5547fe08674f0925a1ea9a
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://cctraff.ru/strik?keyword=essential+examination+osce+pdf In PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/peparaximezur.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/8805769.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/10610.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/xadipaki.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/mikukinib.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/36d7a8276c.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/0c18874847f.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/8010e8.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/8746e.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/modeg.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/6853752.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279037.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/sexebabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9279/3757/files/acls_provider_course_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9033/2836/files/zosudibokezajapazovopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6680/9241/files/el_mejor_gestor_de_contraseas_para_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7686/8514/files/html5_programming_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81aeacd-77c6-4ad3-a9f3-03951157b6e0/30427076318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3565740e-7b9a-4719-a022-74f3e8252594/nezetodilipekukelutu.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_off00006b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B53 5228 bytes
SHA-256: f899f3f88ac736f0035d6f11282bffa038e6d0738a2df4f4ea185c5cd60f0683
font_01_sfnt_off00007d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D10 10152 bytes
SHA-256: f61c0795bcbd21eafd09066b41ea6d65d0ffa07ed3d19efce76b677ffa39dec8

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