Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3def07d11c3e5fd…

MALICIOUS

PDF

66.4 KB Created: 2020-11-24 19:42:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ddd669c04da67fd57d58d61ae6b573aa SHA-1: be543bac50d3996aed9484014c4d4e14c24dd23a SHA-256: a3def07d11c3e5fd07af988d27d906b9c2f0b23967791da380428819d0994e83
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as legitimate content, but ultimately lead to malicious or unknown destinations. The heuristic 'PDF_SEO_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malware distribution attempt. The embedded URLs are likely used to redirect users to malicious sites.

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://traffset.ru/strik?utm_term=branches+of+abdominal+aorta+pdf PDF link annotation
    • https://penusifobituje.weebly.com/uploads/1/3/4/3/134314418/subimadozowipox-zonefapopexo-duporuna-relenozigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_5f9e5847923d2.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/voxipanovigepiv/boxutoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e618bc-2145-4193-b503-4c755a91c114/71167983012.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/bixerejepifawutisezov.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/unblocked_games_2019_at_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636283aa-1440-4642-9d48-761b7d0bdd20/2314141047.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/77705982714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f974e8-ee8d-4af8-8469-79a567917522/66303549360.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/voxenatet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a4500f-714a-4273-b2b0-c65b0e810a5e/70640561464.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_off0000c354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC354 5584 bytes
SHA-256: b00bb7ca7f95878198198d8e896016755e37b94bcaa6b4f48d61ece468dc0da6
font_01_sfnt_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 10844 bytes
SHA-256: ef9b2fe529bf26370016abfa68e258d7d3cd646f18ae847f7de540eb9be37da4

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