Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90a2a76297db58a…

MALICIOUS

PDF

40.3 KB Created: 2020-11-07 21:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: b29c15c182e1d8adf0a9225ae80ef328 SHA-1: ad83c8574b4ae76ecce46210760c820763daed9c SHA-256: d90a2a76297db58a708be019b28e755b0a6d724a0c70f77bc68adac4d81a5a3e
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?keyword=download+the+fault+in+our+stars+book+free+pdf PDF link annotation
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/valedakivoxi.pdfIn PDF document text
    • https://powedumino.weebly.com/uploads/1/3/4/3/134350182/3087385.pdfIn PDF document text
    • https://zegimobigew.weebly.com/uploads/1/3/4/3/134313375/zigojojivubi.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/7ad798bfd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://paxajupivog.files.wordpress.com/2020/11/zikin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f2f376-6e66-4818-a722-d44adaa73b8a/96076417042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46fee37a-5e09-4f0e-9209-3db7a7030139/vupimoxaxoki.pdfIn PDF document text
    • https://rozivulafili.files.wordpress.com/2020/11/dofetura.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/56234941957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17326599-e6f7-4d69-8239-92cc799a1f97/conquistador_maynard_ferguson_sheet_music.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_off00005cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF2 5424 bytes
SHA-256: f24fee62741541839d77c904348007f959dffca0445b14b162c70f11f38b6495
font_01_sfnt_off00006f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F70 10940 bytes
SHA-256: bb575b40ab1662a7853e5f9ce0960de764cd527ec2a9dbfc4a7e465b3c5aee01