Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b7167d0ac22c37…

MALICIOUS

PDF

56.6 KB Created: 2020-11-22 11:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-04-06
MD5: 924059a019397ab979a8b47519bfcc8e SHA-1: da9819ffe26b2073a0c70ee255aca331ccb4fbd9 SHA-256: a8b7167d0ac22c377f8da43954741d5723092b489248457b7e5aa987ee335ed1
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xumabilere.weebly.com/uploads/1/3/1/1/131163638/4829363.pdf In PDF document text
    • https://s3.amazonaws.com/bisute/beginners_guide_to_investing.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/84489247158.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/answer_in_french_translation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483335/normal_5fb8bada8e966.pdfIn PDF document text
    • https://rupunapu.weebly.com/uploads/1/3/4/3/134354814/wusulurixamago.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/online_certificate_template_creator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/desujawotujinotuw.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/baccarat_card_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/67783289485.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/novep.pdfIn PDF document text
    • https://traffking.ru/wb?keyword=4th%20grade%20math%20cumulative%20review%20worksheetsIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000a65e.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000a65e.bin)
    • https://uploads.strikinglycdn.com/files/e928eace-8222-432a-a2c6-5b08c4cc751c/3161887373.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 extracted file (font_00_sfnt_off0000a65e.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA65E 5564 bytes
SHA-256: 28d9fde4da3dc03fd807fe205a01663022bb1f15c9df108aabc53c83a6d55268
font_01_sfnt_off0000b936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB936 8424 bytes
SHA-256: 8b5733619bd0240cc9bc30cbed4a3d73d5a12a95b8d4fedf7db8bcfca5b441fb