Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b98deaee23bc9c…

MALICIOUS

PDF

72.3 KB Created: 2021-02-22 15:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 08ca464ea7c4db4cc8533d6425f66154 SHA-1: 02677a59543d12e78c861ca595ad4a8b71503ddb SHA-256: 46b98deaee23bc9c9068d9d1a90d64474895d678bc2e202cd9a5c063e98df248
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to suspicious domains and one explicitly identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites, aligning with spearphishing tactics.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/123?utm_term=grade+5+maths+word+problems+worksheets+south+africa PDF link annotation
    • http://shoop-fg.ru/4712484589945qvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5fd95831cc68f.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/WCiemD7/dizapubedaja.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/ilihkjj/real_followers_apk_uptodown.pdfIn PDF document text
    • https://xuboxale.weebly.com/uploads/1/3/1/4/131452808/tetiti_poxesa.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/hCrxWGD/epic_jungle_seed_minecraft_bedrock.pdfIn PDF document text
    • http://sehq.xyz/34227000155l3ua8.pdfIn PDF document text
    • http://megantv.site/58402377719smekh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464739/normal_5ff96d2e6c866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402517/normal_5fccc0c694963.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_6001cbb452a75.pdfIn PDF document text
    • https://wisukasef.weebly.com/uploads/1/3/1/4/131453855/39f72f3ce857a61.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/SjdgRgg/immortal_raid_apk.pdfIn PDF document text
    • http://vereffka.xyz/19420107118b4jtj.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/lazolu/poly_coated_kraft_paper_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/apache_tomcat_8._5_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/apa_citation_format_online_article_no_author.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/68840696109.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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 5848 bytes
SHA-256: 536e18dc5667168cfb52848bea4815d78fdd2ce84ed85f98b8bf9ddccf11113f
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10624 bytes
SHA-256: 0ce9ffb662ef9eccad67a7bf21b5e34439bea8c1200d1e07195c4d455dab8973

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