Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef871afbfbf5b66f…

MALICIOUS

PDF

82.8 KB Created: 2021-02-07 22:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8b83834a563e874508afb8424495a710 SHA-1: 78753b452d021cc6b2f7c6db0a6600bcefea670c SHA-256: ef871afbfbf5b66f8beb17e909c5ee1003ad69cf76dc93ab3a59a0195b5e1e10
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain that appears to be a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users by masquerading as a legitimate document to redirect them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wb?keyword=allen%20aiims%20major%20test%20series%202019%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5fc82dd08f4b6.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/wunejisiwekedi.pdfIn PDF document text
    • http://maska-respirator.shop/fobitoniwk327j.pdfIn PDF document text
    • http://copyright-rules-help.com/bewadavavotegoraduxajunuk6gzi9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mewozukejos.rf.gd/8057430586.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/zigopemiwuvupoposaje.pdfIn PDF document text
    • http://mezomiwewelebe.epizy.com/rawivubudifupusazudasi.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/corki_arurf_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/kuwifojafogawaz.pdfIn PDF document text
    • http://genenapukiral.epizy.com/prince_harry_wedding_dress_uniform.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_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 5732 bytes
SHA-256: f9671978fb0bd41e38d8baa0b20e29a744a3731b63cd1fe48d3953fbbb6f268f
font_01_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 10712 bytes
SHA-256: 10547117341c4b68bdaf5ca18abd4183de9bbdad39cafc1737efa779989c2301

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