Malicious PDF — malware analysis report

Static analysis result for SHA-256 7103c74ea60e3122…

MALICIOUS

PDF

72.2 KB Created: 2020-12-25 22:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ee8a156e2874e40be7d3ac31711eea6c SHA-1: 2040cf0c716ccd2ddfd9627bffbec319cce14c2b SHA-256: 7103c74ea60e3122f0d40de86cbffdb5f4a6b5e50baf7885a5dae7bb9cbc0e58
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, and impersonates a cloud document service to trick users into downloading a file. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links suggest an attempt to deliver a payload, likely a downloader or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://gettraff.ru/strik?utm_term=file+manager+apk+for+android+4.+0 In PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/f67f1.pdfIn PDF document text
    • https://cdn.sqhk.co/podizapexiv/Lgjhhjb/fawidizoz.pdfIn PDF document text
    • https://wugebanog.weebly.com/uploads/1/3/4/7/134709888/xeropifetamesi-vezaxevadon-setaxivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456393/normal_5fc3d847671fd.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/vidadaviwal/download_sholawat_burdah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6ca79c-7c94-45a2-921b-fd5a91846620/befulosodaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/009c7b2d-f078-487d-882b-ee4660f8b3f6/95610545625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8238bff4-e9fb-4881-9575-cc3043b6f960/xavozakejikul.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/network_diagram_visio_stencils.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a96b24-7564-4e66-b7cf-93938cbe569e/diablo_3_etched_sigil.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/mutant_fighting_cup_2_unblocked.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_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 5464 bytes
SHA-256: 8b422573e67ca67daaa4c341a947130c46bf577f34541f36b4d9768bc2859c49
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 14656 bytes
SHA-256: 51defaa08bc3609f6b969e6152f122d6b299b95725c2e9b2a5372390cd97a983

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