Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fa0d753b0fb868…

MALICIOUS

PDF

73.3 KB Created: 2021-02-10 08:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: cca608c9a4646426d14c2c37bbf986ca SHA-1: e2f03fbae848f7259d72b503eca436ca72f3e33c SHA-256: 48fa0d753b0fb86834c3a677acdd577c4e620bb0c34f4961140af8721b00d663
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://crophysi.ru/aws?utm_term=dorma+bedding+size+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_5fd8d4f8112cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465277/normal_5fd163cfcbff7.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/fELpijX/judobalebikivasojage.pdfIn PDF document text
    • https://cdn.sqhk.co/xegapanasa/ZjiFdib/38560898128.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/hhjj7id/dessert_recipes_with_unsweetened_applesauce.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/ChdTjdH/vegan_sandwich_bread_recipe_veganricha.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/wibBNRu/polaxivukexeruvepido.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/jd0jahh/history_channel_youtube_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/W0mpCTF/shaolin_kung_fu_dragon_style.pdfIn PDF document text
    • https://kewupadaduroj.weebly.com/uploads/1/3/4/6/134689326/5409825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_600e6bda1656b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5fca257cead46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492600/normal_600220feccf1c.pdfIn PDF document text
    • https://karifizamazo.weebly.com/uploads/1/3/1/3/131383674/supaxejuninivazisali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fcb73ab845c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 5304 bytes
SHA-256: 42ed371787a1f746af25e2dbc5e7ad5fd7023ad06b3cf84be2ccaac6f26aff0e
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 10564 bytes
SHA-256: e0ace2e4a0fc684c6b8b7e0a04e8b7ef6d2614e445a6215bd2508ea0dcded024

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