Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb9ac2f80c5673e…

MALICIOUS

PDF

84.2 KB Created: 2021-02-22 21:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c311940e9f428edab894e4325aa01077 SHA-1: d0e3ad719090761aaa8f47d5bc1e02dac28ffd00 SHA-256: abb9ac2f80c5673e66bec707c31075e74ea96c6e4698313bd11d26ffcded03ff
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. Heuristics indicate the presence of external URIs and a high ML classification score, along with a ClamAV detection for Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to 'summer reading'. The primary IOC is the external URL, which is likely used to host a phishing page or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=lhs+summer+reading+2020 PDF link annotation
    • https://cdn.sqhk.co/matijamaj/jhhLn8q/71853533121.pdfIn PDF document text
    • http://hookup666.site/corporate_responsibility_sustainability_report_airbusd0s9m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_6011ecba2899d.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/pewebopufupe/nudegufaro.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/8849711764.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/ubuntu_18._04_lts_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/wilimos.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/edinburgh_university_accommodation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/compound_word_worksheets_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/7398284650.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/pabetolubitejewuda.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/doorking_9150_slide_gate_operator_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/1275312483.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_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 5420 bytes
SHA-256: 17b44adfef3fd210e9cfe8b32c9c991eaf2d92dfc9604360ead1d5eebf6d95da
font_01_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 11228 bytes
SHA-256: f56bce2c0240ed7d962c2702b677d23aeba7bd31bad1fa4b1f3cb73692e8b17a