Malicious PDF — malware analysis report

Static analysis result for SHA-256 4555b2b92c86a657…

MALICIOUS

PDF

83.5 KB Created: 2021-02-23 12:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ee0c170fe72665dc489643074c7ecca5 SHA-1: 16960e527c8b1b391b56a75b2ce6b90227fa74eb SHA-256: 4555b2b92c86a6578f9736ea05bbdc4db47116cc96691640d98e707f661d8bfc
154 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 as malicious by multiple heuristics, including a critical alert for a malicious redirector link. The ML classifier also assigned a high probability of maliciousness. The embedded URL points to a known malicious redirector, indicating an attempt to lure the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/strik?utm_term=r+shiny+machine+learning+example In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_6016117dd14a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407102/normal_6003a516320a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488135/normal_601a99bf3d9e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481830/normal_601fea238a06e.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/iiqf3hb/gosakogukokidebes.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/ijfr0vI/46627723994.pdfIn PDF document text
    • https://cdn.sqhk.co/dulidara/hjAgdDv/72372241633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_601d5b822a87e.pdfIn PDF document text
    • https://cdn.sqhk.co/gumojitoxowu/0obQhfu/wejejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_5fe8778c16efa.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikikozazilut.rf.gd/create_latex_template_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/font_bahnschrift_light_condensed.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f5c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF5C0 13012 bytes
SHA-256: 531cbd00254b706db1c6f7bfda0a4acc17055c301a2c0c68081ba5e012428d57
font_00_sfnt_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 5524 bytes
SHA-256: 1a4a1a86f26b08dfb8ca1887f072dd001a690607280378f486bb0c3fcb2811ce
font_02_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 11756 bytes
SHA-256: 8c38f06e5c7f53b2ceb31dbb0182d11f69777263c5e816a54ff857324871a2f5

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