Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1b7443856ac7ee…

MALICIOUS

PDF

74.8 KB Created: 2021-01-24 12:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 211db25f433ac2a3e3630a33709246a6 SHA-1: e0576ad9b71d13dde550c120ef25e2bbf61bb590 SHA-256: ed1b7443856ac7ee2ce11a30a0f3eee4f7948adb902147186726e86b6a34fbc6
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a medical quiz.

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://jottigo.ru/aws?utm_term=cardiovascular+system+quiz+for+medical+students+pdf PDF link annotation
    • http://jenirafona.22web.org/vunemomosibarupupi.pdfIn PDF document text
    • http://gozatelaji.22web.org/bawarchi_restaurant_menu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_6009277101e52.pdfIn PDF document text
    • http://palifagumelu.22web.org/printf_cannon_rush_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fd1df19840f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5fcd445590d08.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/vuzalorob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447431/normal_5feb1c54d3489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_5fd284ec4d2ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446016/normal_6002963e65800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411935/normal_5ff2f1c56c0cf.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/vuzufexarevima/39143534146.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/joomla_template_j51_renovate.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/jizuzube.pdfIn PDF document text
    • http://xonelamurojili.rf.gd/25661168880.pdfIn PDF document text
    • http://wogafut.rf.gd/commutative_associative_and_distributive_laws_worksheet.pdfIn PDF document text
    • http://koxowasone.epizy.com/xujaxomususularibine.pdfIn PDF document text
    • http://jewojaregoluwat.epizy.com/57421357805.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_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 5544 bytes
SHA-256: 9405f8bddedea1535c4215173dbd2e2e2a27b09b9cf7b604d0d959ea25cf80c8
font_01_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 10960 bytes
SHA-256: 6caacaae133b5016e76ab4e5c593903bb8d9d7d83599a0172fb03e51c07e28bd

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