Malicious PDF — malware analysis report

Static analysis result for SHA-256 1850b31189303e6f…

MALICIOUS

PDF

64.6 KB Created: 2020-11-26 05:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b48de9303162ab0765fd19887990e9ff SHA-1: 96392cd71924ec9114a92d12b49ae16281ff034e SHA-256: 1850b31189303e6fced9b819b47dcf2a3bafea0becbee86d950e8faa10e4d7d4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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=falling+creek+middle+school+supply+list In PDF document text
    • https://vekaforu.weebly.com/uploads/1/3/4/7/134747957/zisonejan_bewakexibalu.pdfIn PDF document text
    • https://sobaxijuxoje.weebly.com/uploads/1/3/4/2/134235367/zujupis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5fa3e636f1de6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5fbc676c2a58e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5fad33f6e2419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482413/normal_5fb2734a72632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_5fa4c7a602f95.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/mijedusovineti/25950100852.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/fokobesunarejinapusejusa.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/bunoxirofenasimurotuxitaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bac3082-8055-4239-a2b9-47167c77865a/82920413350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d441963c-5ef1-4307-b70a-4f0bf50781be/57050934427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cade34ca-f27e-456d-aa7c-34717017a4c6/fazugelu.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/87364522468.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_off0000bf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF33 5608 bytes
SHA-256: 4d17a26fffea1d8660095b76343af0ce27228111fd474e91791eb862e912c45c
font_01_sfnt_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 10240 bytes
SHA-256: bb9be8537ea221ade17667bdb714ba838bed48046fc5905ba46102cfb200afe0

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