Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b4575a7b94cc3b…

MALICIOUS

PDF

70.9 KB Created: 2021-02-21 12:09:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4cf9e81ec0616145ceba79965dd31c31 SHA-1: b8814e0d688918c5ab3c0857935d77a54937a5db SHA-256: 23b4575a7b94cc3b70455fece8d505ca17017ce7cc14ff673e3772105849e0eb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious content distribution. The heuristic PDF_SEO_LINK_FARM indicates the presence of numerous external links, suggesting an attempt to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving spearphishing attachments designed to lead victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/123?utm_term=o+come+to+the+altar+chords+key+of+g PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5ff2caa28c4dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447108/normal_5fdf92514c185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_60273f90a1b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_601df118122f9.pdfIn PDF document text
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/d99e8d1e88d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5ffe87676e413.pdfIn PDF document text
    • http://kujazudoxiro.22web.org/english_4_textbook_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_600c8b2e7cab3.pdfIn PDF document text
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/32fc7c1191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467306/normal_5fdea0e236e06.pdfIn PDF document text
    • http://tradestaroffice.com/completing_the_square_word_problemspiay6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420911/normal_603144030ff12.pdfIn PDF document text
    • http://yogist.fun/7901273535198oll.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368488/normal_5fe065e940d05.pdfIn PDF document text
    • http://mawidoxejonej.iblogger.org/tunorefir.pdfIn PDF document text
    • https://fezowekufeda.weebly.com/uploads/1/3/3/9/133999429/latizu.pdfIn PDF document text
    • http://sportita.fun/wuxigojfkfv.pdfIn PDF document text
    • http://help-ruleviolation.com/paypal_customer_service_hotline_usvvov7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_6011c4f81456e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495065/normal_5fca12732317b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xanawuvogi.epizy.com/1699601139.pdfIn PDF document text
    • http://vutafinaragod.rf.gd/26569448014.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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 5628 bytes
SHA-256: 0e3121f967d0b35b713b8503d0afcbb4b6c0e0447db1cef860f724a264436cc7
font_01_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 10340 bytes
SHA-256: 71b4297ed1b37c50d58b8e9259d25abbc3ba9a930c921e916379e49fe68b2bc9

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