Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f56e0c1fb1c4db…

MALICIOUS

PDF

71.2 KB Created: 2020-12-18 01:04:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 18d49cfad5a74c52c8c6e6c4d78dfa9c SHA-1: db05223280313fce3bbfb27958795776789b7988 SHA-256: b3f56e0c1fb1c4db3ec745649ec9b766dc0d364cec39d1f7e26f767bc026992f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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/123?utm_term=big+heads+soccer+world+cup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f926248028ef.pdfIn PDF document text
    • https://lolusegixasuvar.weebly.com/uploads/1/3/4/7/134770702/kewijefifutozefig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fc4d1e1e479b.pdfIn PDF document text
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/budewinekov.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/febopa/cadbury_nigeria_plc_annual_report_2012.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d88a504bb4653ce18603/t/5fd6c649acac596b0cca1b97/1607910989107/highlight_duplicates_in_two_excel_sheets.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf514d6457125654316074/1606373710339/elf_on_the_shelf_welcome_letter.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf679d2dd96f5918e72b10/1606379421696/biputozaj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10303bdb33045eec2ea8e/t/5fcb87de551bdc47e7a9e0a3/1607174111683/dosud.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_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 5476 bytes
SHA-256: 0e5a34a4343814c2212954b008699b41a98839748259cc95738318d594409a4a
font_01_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 10668 bytes
SHA-256: 74a7be31c94bf28f02022b5059886cbc3efbc5d5dc3877f739436afa0af91733