Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a0f2fc74e83755…

MALICIOUS

PDF

75.1 KB Created: 2021-02-18 21:10:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f8eae18bf631e0e408b069609c651ffc SHA-1: 44bb6e17509d88a5cef35f002b561245bb05c1c4 SHA-256: 77a0f2fc74e837558ec1657fb92fe63f752e27d91abee4d2e76319a011fda40c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent. The document's purpose appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=vibe+kayaks+sea+ghost+130+13 PDF link annotation
    • https://cdn.sqhk.co/xogovofofi/Jjdjggh/ghanaian_worship_songs_mixtape_mp3_download.pdfIn PDF document text
    • https://jewevugaxezi.weebly.com/uploads/1/3/5/9/135967143/875638b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410006/normal_5ff346da86c05.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/P3gfs8O/nirus.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/wosekal-tafeg-zisolin-fikupu.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/J4EgdiJ/gozezeximijabakegikatiwoz.pdfIn PDF document text
    • https://rorobobadewa.weebly.com/uploads/1/3/1/1/131164171/bekanabosoja_nisatu_nidel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_6023dc88715b0.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/dofufiri/45532995604.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/dead_by_daylight_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/73454813628.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/a_versicolor_bite_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/facebook_free_install_for_windows_8._1.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_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 5448 bytes
SHA-256: 39bfd209a61c463ee83c6f5852cbf617d9c2c5891dc4027da36e9ae333d23d6f
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 10476 bytes
SHA-256: 2d5d672f10b86281ead100a7ef0f129f83296bf3d6805f665b48b5d61eb336e3