Malicious PDF — malware analysis report

Static analysis result for SHA-256 4257e8b40828c421…

MALICIOUS

PDF

65.0 KB Created: 2020-12-08 04:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-15
MD5: b12b0017fee932c355a2f9d5fe9a73cb SHA-1: 6b908d54fa78d8ebafcb96ef9d9693741a364076 SHA-256: 4257e8b40828c42168a07c402cd54ea40dd682cdfdfdc3d3d1c42673d2a82adb
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/strik?utm_term=to+kill+a+mockingbird+trial+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501509/normal_5fcb37630bf5a.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/vesusazutonug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415068/normal_5fa7f5f0a5dc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_5fa987e00d468.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/xisakazelelinim/70209817985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecc8d9c-d5ed-443b-9f89-a6c49e9e6019/great_outdoor_provision_wilmington.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/prache_anti_aging_cream_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/nowugenumuxirudegu.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/comptia_study_guide_for_network_n10-_007.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/teaching_transparency_worksheet_formation_of_ions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/93324776281.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/ford_mustang_logo_fabric.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_off0000c33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33A 5512 bytes
SHA-256: ebe02ec1983f7a13d7fe2f3c202a63163ee98d4e4e528ab46a547e4355e03090
font_01_sfnt_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 9756 bytes
SHA-256: 3923eda48505c182e66bbea3740d962ec8a6a9343490cd5d1acb5c7b9090faca