Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73f09a84a5bdce7…

MALICIOUS

PDF

97.0 KB Created: 2020-11-16 12:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d691685072a878d36c3e92a105e75049 SHA-1: bd082b117eca475a5623b406d962dcba8abd2214 SHA-256: a73f09a84a5bdce706d9ab717ccfc8488eecd2eeab7ff254cda8c5afd8ef5430
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware delivery attempt. It contains a link to a known malicious redirector URL, https://cctraff.ru/123?utm_term=stanford+supplemental+essays+2018, which is designed to lead users to malicious content. The document body, though heavily obfuscated, appears to contain text related to 'Stanford supplemental essays 2018', suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/123?utm_term=stanford+supplemental+essays+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f9c930b84d74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/gipiv.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/hotmail_email_configuration_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b91e87-be59-4d7f-b504-508e22a9cedc/sofekopemeb.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/volonupasusozuritedilom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b4de45-970f-4654-a057-d8f38d66c471/dapirugiluvulag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f5347e-be92-45e0-b706-7ab758624f38/7631999038.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/99786158987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b679c7c-f2dc-4403-9d1e-b26eb7d578dd/vajatepubebegodite.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/notolez.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/bransle_de_la_torche_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745fa4f0-a23e-4160-ba98-4b352f41a2cc/49150668220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f47e8b-36c2-45f5-bcd1-afd7f65df1ee/mubokalopew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4adf28ba-c1f0-47fd-bc92-fe2563da9734/sokajokibigipelidanezaz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EE 5744 bytes
SHA-256: 2352fd0b24fe73f0186ffa71be72d3a71273f65ce48dfbf835909c51e39e4904
font_01_sfnt_off00014469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14469 10784 bytes
SHA-256: 12dcdb04e8dee61f558915d0ee99ed19f3f26d70c39945713ace2920efa5adf1
font_02_sfnt_off000168cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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