Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ed0f5bdefcb773…

MALICIOUS

PDF

71.1 KB Created: 2021-02-18 05:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c60bbf9b6cb3c7c04c078783f78b442a SHA-1: dc517098679df9034554933e24384f0e1959ee0d SHA-256: 78ed0f5bdefcb7738b50814cdd57e852676116a2508a797be82e22c8fc0ef8b0
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to meeting terminology, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/strik?utm_term=what+does+post+stand+for+in+meetings PDF link annotation
    • https://cdn.sqhk.co/falupuvevore/gi9rJjh/16692355523.pdfIn PDF document text
    • http://raifaisentgo.online/43606454728ry9rf.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/gojavanedug.pdfIn PDF document text
    • http://edaruzal.xyz/133534502269tqqc.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/3887896.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402000/normal_5fcb1c618c2a8.pdfIn PDF document text
    • https://fezipogapatud.weebly.com/uploads/1/3/4/8/134888370/pefutagobejojajeki.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/potamotaz/checklist_template_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/xeradotufev.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/wafarenow.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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 5436 bytes
SHA-256: 67472f71d1e2f4db18226b210c27796fd60302c15d3c685f88b871940e26d005
font_01_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 11080 bytes
SHA-256: e5b2002f53a3477c7c6d38063dedce94d3206fc3fb06c3a0587ff2262358837e

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