Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d48bd6a1baf8f7e…

MALICIOUS

PDF

79.2 KB Created: 2021-02-28 05:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8b23c09bf3dc6e3aba030f964fab9368 SHA-1: b1924222043b7d0da914ea198fdb3c01945ff720 SHA-256: 2d48bd6a1baf8f7e552da37ee7aec87db4d6539f5eb78f3ad7a5189cae872773
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to reference 'Vizio sound bar subwoofer not connecting', likely a lure to attract users searching for technical support. The presence of numerous external URIs and the link farm heuristic strongly suggest the document's primary purpose is to redirect users to potentially malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://soxebez.ru/strik?utm_term=vizio+sound+bar+subwoofer+not+connecting PDF link annotation
    • https://cdn.sqhk.co/nivatasob/yIP4ieA/pound_cake_cupcakes.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/geoidjj/art_history_masters_programs.pdfIn PDF document text
    • http://yourbigdick.space/pojumojetopasudiwitawndqmj.pdfIn PDF document text
    • http://bristol-yalta.run/zusimunozesagite8pp5v.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/jhiv9hg/vitalsource_bookshelf_login.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/gj8ySig/63792927894.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/cCTDLgf/podimosezulalovej.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/aD8Neig/history_of_thanksgiving_history._com.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/3e06c0.pdfIn PDF document text
    • http://hesap-al-sat.com/6_man_tent_with_fitted_groundsheetd8e1y.pdfIn PDF document text
    • http://hookup750.website/livamix3fqf.pdfIn PDF document text
    • https://cdn.sqhk.co/kojogitu/ejhC5gd/18355559899.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/xejezaviwulize.pdfIn PDF document text
    • http://sreda.city/greek_root_words_biologylpz4y.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/D4hhhie/fanosikezofapud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 5284 bytes
SHA-256: a902d8cbfef703a8291ba6f3f59329fbe579303e573c03617da9434c26406927
font_01_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 9972 bytes
SHA-256: 6e6d2c0634b19ed92c70652c12da16cd39478cf657f90b97e8fc7e1c74515bb5
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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