Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bcd5ceb5d6df51…

MALICIOUS

PDF

77.4 KB Created: 2021-02-26 00:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 022e1319a42300135199fcb50a5d93f6 SHA-1: 799ee6d1f6e321e1ddfbbec1a86a24664afb5d0a SHA-256: a9bcd5ceb5d6df51b4780dc57b9285f2bc88ef172de7fb52bb46546882842ec3
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://yafferge.ru/123?utm_term=how+to+easily+forgive+someone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_601f315cc0753.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/gOF83hc/top_ten_retro_boxing_gloves.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5ffe6498cd8e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_60248ba78e345.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/fB3gcrG/learn_to_play_piano_free_download.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/notas_de_canciones_cristianas_en_teclado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_6028a0901845e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389352/normal_6031cced4e84a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5fccdd57cfe2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5fe8577ff15d3.pdfIn PDF document text
    • https://cdn.sqhk.co/wefonasifaza/Xtgj6gf/7612362197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_600ea012f0589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_6009c11b15de6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478141/normal_6007f988db436.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/goneduzum/33380198339.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_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 5304 bytes
SHA-256: ca6c8696e1a1f73216feb6ac72d33471179d752048f6505e08555f3c0c286b0b
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 10256 bytes
SHA-256: 1db4efa54d156d2eca202be161271c16c919320017b0aaf369b476a40f6549ba