Malicious PDF — malware analysis report

Static analysis result for SHA-256 700663442e32c36c…

MALICIOUS

PDF

66.0 KB Created: 2021-02-10 01:04:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 828540bc93670f445d0bb809c747c696 SHA-1: 3a4e160b51916d3eb957c4466e3f49003cae8ae5 SHA-256: 700663442e32c36c4545d6718ef64c301b80c546cb39fcf58231b673601f97f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking pattern are commonly used to redirect users to malicious sites, potentially for phishing or malware distribution.

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://maypoin.ru/wb?keyword=html%20tags%20list%20and%20uses%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5fd069935ab10.pdfIn PDF document text
    • https://cdn.sqhk.co/vakusukereju/OAhfjj6/misujuvibiborikawututo.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/3689294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378149/normal_5fef4e80639f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5ff1cad9f309c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_5fd975ddc40ec.pdfIn PDF document text
    • https://kamukijupekud.weebly.com/uploads/1/3/3/9/133997827/japesapebifafikapow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5fc8603fce7f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_602309acd5327.pdfIn PDF document text
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/3ec615358a3.pdfIn PDF document text
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/poxanusuv.pdfIn PDF document text
    • https://xusopulude.weebly.com/uploads/1/3/1/0/131070786/4299224.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/gdgcFgj/easy_pay_metrocard_revoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_5fd91a148a79b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nodikisiti.rf.gd/rectangular_form_to_exponential.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_off0000c516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC516 5228 bytes
SHA-256: 2b39002cc83b081de4ce76b288aabb1cd4160bd31a247ad70f48a8cd8a72d560
font_01_sfnt_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 10700 bytes
SHA-256: 4973a373a4d3ece4966b304648d8a338a1e290837ed47ac57c87bdb7762a49e3

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