Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f23e18e36f00561…

MALICIOUS

PDF

47.6 KB Created: 2020-10-04 11:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 7888299f4cf65cf298ac1cea5a5b1ea0 SHA-1: 5dd064e9d064cb489040ce63dc2d85ea0c50810b SHA-256: 4f23e18e36f00561e3c805578486f407b86d60ff538d5bd409d9d61add1da8a7
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=common+sense+book+of+baby+and+child+care+pdf In PDF document text
    • http://files.dawnsbodyshop.com/uploads/1/3/0/7/130739509/tapokuzaxigi.pdfIn PDF document text
    • http://files.writetime4him.com/uploads/1/3/0/9/130969506/ac53b93d546.pdfIn PDF document text
    • http://sopikatus.eastgwentreferees.com/uploads/1/3/1/6/131637419/fojusapimukerirug.pdfIn PDF document text
    • http://junukero.scatkofamilychiropractic.com/uploads/1/3/0/7/130739377/redojomode.pdfIn PDF document text
    • https://site-1040576.mozfiles.com/files/1040576/38167962456.pdfIn PDF document text
    • https://site-1037914.mozfiles.com/files/1037914/19560945367.pdfIn PDF document text
    • https://site-1039002.mozfiles.com/files/1039002/runagudejomiw.pdfIn PDF document text
    • https://site-1039642.mozfiles.com/files/1039642/nokozidiguj.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
    • 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_off00006c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C55 5432 bytes
SHA-256: 9c82ecfccfe584c8208a47c05aa25bcd0e34668fb4176c57c78ba17799398153
font_01_sfnt_off00007e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E99 11116 bytes
SHA-256: 3970caa0bc59c8884884bf24c2bc169a1f10131a9f0ed549424007cc371dfeb7
font_02_sfnt_off0000a327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA327 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230