Malicious PDF — malware analysis report

Static analysis result for SHA-256 c950e4d75087c6cf…

MALICIOUS

PDF

71.2 KB Created: 2021-02-18 20:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 19434c9b93267b0e3f5bd88522af2387 SHA-1: 13e0184c6e2583592c3bfd093363db83e0f77403 SHA-256: c950e4d75087c6cf636251e931dc6a8a0ca6d29bb8d8c119b3e8d1d41d5e0ef4
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a lure for movie search results, indicative of SEO spam or a phishing attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded links further supports a malicious intent to redirect users. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/wix?keyword=amadeus+full+movie+netflix PDF link annotation
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/dutizuzofaludo-wilelozug.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/ihgimji/bezotomejaxu.pdfIn PDF document text
    • https://lenumerizak.weebly.com/uploads/1/3/5/9/135962539/bcc7222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443325/normal_600101ee2e884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5ff0183b16cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_602c09a1c771a.pdfIn PDF document text
    • https://cdn.sqhk.co/wukomidekepu/ijUgLji/35631625526.pdfIn PDF document text
    • http://garant-ritual.online/cisco_asdm_manualdc8la.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/zerepuzuze/guximezuxikamilepozu.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/hyperbola_standard_form.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/53211760951.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/aquelarre_libro.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_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 4956 bytes
SHA-256: b59d459f469dacf6c9080a14039e36d0e7089ff29811e725ef5ed76d7bc695cd
font_01_sfnt_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 10796 bytes
SHA-256: 4a788b552a810a6bc77d1290757730e2ccfb9f559b45b9160b24504bdb672fdd
font_02_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3