Malicious PDF — malware analysis report

Static analysis result for SHA-256 831bc2541e1cf922…

MALICIOUS

PDF

67.3 KB Created: 2020-12-07 23:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 30923d6fc10fe60c2d77bae04e658219 SHA-1: bc10d3ab113c6f669f6b6efc57ebb427518cb940 SHA-256: 831bc2541e1cf922263e8d511ef96ffc916fc04bbbff860af2d0af7aba6ca5ae
156 Risk Score

Malware Insights

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

The PDF contains an embedded URL that mimics a search query, directing users to a suspicious domain. This, combined with the PDF's structure and ML classification, strongly suggests a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF's nature and the presence of external links indicate it's designed to redirect users to malicious content.

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://trafffi.ru/strik?utm_term=how+to+find+jungle+biome+command PDF link annotation
    • https://pebetojakudasud.weebly.com/uploads/1/3/4/8/134879391/zemida.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/208521.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/paxuvagal/all_in_one_seo_pack_wordpress.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/ririjusif.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/android_tv_box_4gb.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/wurifabiba.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/exponents_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/fajev.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ad52bd14ff0dd2bd38c4/t/5fce9c97baa6f26ca80f085a/1607376024701/pimisulamixatevavozozutom.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/json_formatter_c_web_api.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/blackberry_bible_free_kjv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c9c111f6a41984851340/t/5fc0e93461e25426e1596ad2/1606478142231/jedafifilusedolarerobene.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/lowercase_letter_g_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/chat_application_project_in_java.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_off0000c92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92B 5336 bytes
SHA-256: 8b744e96213f39eb074ebe3553809535a4a90fb153de5983b2a66c9d87c37c83
font_01_sfnt_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 10868 bytes
SHA-256: d22a5bc9c279542c4d3ba1f0d6f9b78a823556db2fddde4d28bd0f011fbd189b

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