Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7efd16fbbface9…

MALICIOUS

PDF

118.0 KB Created: 2021-01-06 16:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-18
MD5: de94605afa6a2fdd4cff6fda7f64eec4 SHA-1: 4342377d61c270f720985e40e7e0dc9c1e00d579 SHA-256: cd7efd16fbbface99ef1aa38f2db0f9c1c20124857aa20c15d67a8a9448aaa25
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wb?keyword=smart%20structures%20civil%20engineering In PDF document text
    • https://static.s123-cdn-static.com/uploads/4496812/normal_5fc825b4ebf21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5fecf75d591ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474220/normal_5fe2877f0815c.pdfIn PDF document text
    • https://fagugirawax.weebly.com/uploads/1/3/4/3/134388021/109be9acd838f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_5f9b3fa485a94.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/Kha1C0b/biposejikafetefuwegugopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e7c873c8-7557-48e2-a7d6-9e38aabd282e/vampire_slayer_quest_guide_2007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/873e5838-426a-4365-9e4f-6e2ab81b3c99/59872090076.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/5th_grade_math_practice_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/82181942766.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/debt_collection_guidelines_queensland.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/10546387723.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/download_google_chrome_offline_installation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18581 5056 bytes
SHA-256: 7ab65db4da6fa03eccd30d27c95d5e765848837e8f41837931b81f71c44bd244
font_01_sfnt_off0001968a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1968A 11300 bytes
SHA-256: cf02eff85f5c75a88d62d49bae08a59f34a812dca775116f1f1c025cc21ddf78
font_02_sfnt_off0001bcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCBA 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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