Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d95e7f6d352e33e…

MALICIOUS

PDF

74.1 KB Created: 2020-12-10 00:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8550581cd358b330b43931da86b730dc SHA-1: da08c6617c72234bec7834fb5f7b082a8e9fca61 SHA-256: 4d95e7f6d352e33ee8678e30a58e4d0d6d3eba877e1ed8b4ab47f02a4920b61d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=elder+scrolls+daedric+princes+fanfiction PDF link annotation
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/nubunuzigikefikenami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405202/normal_5fa70609910a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fce3ebfc190381d6d6521f8/t/5fd05e82a9460057587c6ebd/1607491203612/88524289958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e2837f-f803-4554-8b77-b5a8d7cac091/74065702649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86ee883-1deb-48b6-a5c9-78be1f8d5ca1/24809578848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43584cd-0bd7-4213-be4a-d2ab80f63b34/free_google_play_store_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ceca72-877b-4512-96ea-9c5444f5ed59/word_families_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/werusawifoxolosim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04409bfc-0f8a-4aca-b135-e19f8c0c0283/rumetonixibopibujoke.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc16b4168612547ed61cedd/t/5fcc05dd5177ea328cae5e59/1607206366447/76539734471.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_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 5108 bytes
SHA-256: 4e28077b89bda9b391fd2d1ed4cfdb7185a6ae7a9e0cc075dc0fd4c2d362ab4f
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 10668 bytes
SHA-256: 712a8fa37642b75e7e02f40565549c9df7e4d461495d26e550e0d2236ffbbeeb