Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1d5c0f034d7b53…

MALICIOUS

PDF

63.4 KB Created: 2020-11-30 13:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 728f03eca2520afe8b00fccfd52c40ec SHA-1: b48efe8e0f58e6db05d9c1d0a80ee80f42ecfb14 SHA-256: 4d1d5c0f034d7b531b043644bcbece298c07c17d7f4769eae247f293cfe08f9f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one prominent URL suggesting a phishing or malicious content lure. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of outbound links, likely for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

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
  • 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.
  • 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://trafffe.ru/strik?utm_term=back+to+the+lake+3rd+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374362/normal_5f9e817c71dfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5fb80e5fc6645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_5f91fdb064109.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/8536469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/539980a8-0966-497f-9ea8-ca5482591938/fcs_playoff_scores_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/edit_foto_line_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d44485e-be85-44fb-ad5c-470616506f9f/bogliolo_patologia_geral_8_edio.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/five_nights_in_anime_2_files.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/9381630929.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/government_briefing_paper_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/80422632295.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/88447708321.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/mckelvie_intermediate_school.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_off0000b9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A2 5344 bytes
SHA-256: 2bfe5fad690ddd8dddd138b261e742e8930c022a23b4ce2a6e80bf9cde14b182
font_01_sfnt_off0000cbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCD 11268 bytes
SHA-256: 87ca1b5e5cc0e1799858831a30feadc9b590eae8d52ce8e9f86b095e19958c0f

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