Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d20013c568fbd6…

MALICIOUS

PDF

46.3 KB Created: 2020-11-01 21:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-27
MD5: 39c2b2d5ff1511ccb9d0e1134e55892e SHA-1: 5e3f39178d1d06c15857bcd852ae76eebf3b6121 SHA-256: c5d20013c568fbd6fabcbb983d90ae99231f7b8111b8a060c0040336575d44fa
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?keyword=nih+policy+manual+chapter+1135 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5f8b8269d5ff3.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/vaxukekiwurefebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f88d94048231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5f9897d817e02.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/bofake/jujiromofuritinilolod.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/mechanical_engineering_drawing_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/marketing_mix_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/kefefopigugubatanago.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/fpse_patched_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/34721890502.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/zijaba.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/dizosoxetikaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2467/7565/files/whirlpool_accubake_oven_service_manual.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_off00007749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7749 5404 bytes
SHA-256: 625282a2c80b504b2e17e9f279573f9503a952cb84692126426939f4438094fa
font_01_sfnt_off00008999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8999 10076 bytes
SHA-256: b1e9aeb12cb4e75efb43e1fc2f7b4c205b007f8bc321bfbc3ff8f42a415b1340

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