Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d32817ac757cb6…

MALICIOUS

PDF

67.6 KB Created: 2021-02-24 15:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9f57bb356feba4662c3f6441ba6af803 SHA-1: a08ed0e5a5e8921d94108544b8b034e9f33f958d SHA-256: a5d32817ac757cb6b57c458661c1e63aa53d7031e4cf1745584685772cdb8822
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or SEO manipulation attack designed to redirect users to harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+do+the+mask+symbols+mean+on+apple+watch In PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/6566577.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/5433475.pdfIn PDF document text
    • http://ig-objectionform.com/64965473062s7i2s.pdfIn PDF document text
    • https://dananiruw.weebly.com/uploads/1/3/2/7/132741593/5340703.pdfIn PDF document text
    • http://weareanonymous.org/cebuano_english_translator_pro_apk3rt2o.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/eKl6eIc/pipezidobod.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/words_their_way_assessment_paper.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/fatikonavori/formacion_argentina_francia_mundial_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/december_neck_deep_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/2199287914.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/camelot_mini_series_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/palabras_para_brindis_de_boda.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_off0000ca92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 5628 bytes
SHA-256: 8c739279be825684920a5da7518e8f2613ce7b23533f48b1aed37cecb0ecbafc
font_01_sfnt_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 10604 bytes
SHA-256: f7cae4fc7b8e93339e46022aeb7a02b9ceb549da8344f8a2970857f54f24d9fc

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