Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa38508001584b95…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 17:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b9e5c9756cd71da2f8c694745c049570 SHA-1: 9f07d8bfb3d36d995cb8960255715f472c3f993e SHA-256: fa38508001584b9504c225203254d0a7d61844ebdbd59bdd6ab694eae59f88d1
96 Risk Score

Malware Insights

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

The PDF file contains a URL that, when clicked, leads to a malicious domain. The document body, though heavily obfuscated, appears to be a lure related to smoke detector issues, likely intended to trick the user into visiting the malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=why+does+the+red+light+blink+on+my+smoke+detector PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fe16a65bd052.pdfIn PDF document text
    • https://cdn.sqhk.co/xabiximakef/hbcjcYq/rolly_legs_hack_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/e6yrE8I/linibom.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/sobipuzunixelorujof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456372/normal_60059e5c6775f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5fca94e751cee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_6057edd0db555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_602c70c78c956.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487935/normal_6008d1f6d02b4.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/gh5hFia/twisted_wonderland_lilia_voice_lines.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/geruweli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413735/normal_5ffd7e193bc8a.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/pulsar_135_parts.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/sportline_4065_watch_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lufevexos.atwebpages.com/julejisopajod.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/salezunolaviku.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/job_application_letter_format_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/wovam.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_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 5460 bytes
SHA-256: 6fdbad275a7768dee2b1062b577a51abde4a4d435006c98f1915bd019c925821
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 11112 bytes
SHA-256: 28250a07307f2b096fe3ee537b6ace3eb08694ea519dad52ec9e576e0227987f

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