Malicious PDF — malware analysis report

Static analysis result for SHA-256 9106100eb5f89e76…

MALICIOUS

PDF

65.8 KB Created: 2020-11-19 07:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f098d3020c9973c3988318c0e8d272d2 SHA-1: 1d0f53544398614761bf6707d850333d3553cf03 SHA-256: 9106100eb5f89e76fb86aa60434f5090fac13fd0486df55f9af8100afe001f47
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating an embedded external URI. The PDF document contains obfuscated content that appears to be a worksheet, suggesting a lure to a malicious URL. The primary IOC is the external URI 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-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://trafffi.ru/aws?utm_term=isosceles+triangle+base+angle+theorem+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404285/normal_5fb5b84543240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_5fa42acb0320a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5fa482b5e69b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_5f9f7d7d2bcdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5f916418b394c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f8b0c7f30404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_5fa8f30d3f724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5f91e009eaade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f94f5a-5156-4b36-975e-ef66857aad73/mugido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf7d18a-1f96-4ebe-87d7-c63028976fb7/81057187896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9597e950-0f77-43e7-a170-8656a2906ae3/dragon_mania_hack_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421a996c-1238-4e18-912d-171c68feacf9/21479535870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed7a721d-44e1-4b58-860e-e486ae6c81c6/21999163819.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_off0000c577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 5444 bytes
SHA-256: 966c8b4b25c21d5920c5b0dfd0e0cb575b35e3e33e2875afade3d3b0da7bc6a6
font_01_sfnt_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 10092 bytes
SHA-256: a9e9343f9c5ebfc4756aa69635fc8f0bdc841c6d7865f624df3c45bc7028ce83

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