Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b53d7b25716547…

MALICIOUS

PDF

38.5 KB Created: 2020-06-18 04:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 9022baf2958bf4d21672a29180b80208 SHA-1: 475de95c66f28962f42b1f3aa7b3edc93a12152c SHA-256: 87b53d7b25716547dc78fcdc68b594253c99433a00b69ad3df2dbc82a43bc21b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or distribute content through a network of linked PDFs. No scripts were extracted, limiting the ability to determine a more specific attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 http://fearlesjourney.com/uploads/1/3/2/6/132683330/132683330.html#catia+cam+tutorial PDF link annotation
    • http://q1.undesirable.us/uploads/1/3/1/3/131379060/2741250.pdfIn PDF document text
    • http://starkfitnessandrunning.com/uploads/1/3/0/7/130738819/pekipori.pdfIn PDF document text
    • http://paulhannahestateagents.com/uploads/1/3/1/1/131163931/63fe8e08b4ca7.pdfIn PDF document text
    • http://whitehallstoneworks.com/uploads/1/3/0/2/130272452/bedofazalazubokiva.pdfIn PDF document text
    • http://openparadigma.org/uploads/1/3/0/5/130590507/govelexedufa_loguvuz_sajobabexeledes.pdfIn PDF document text
    • http://gfoxinc.com/uploads/1/3/0/6/130604279/3ba30.pdfIn PDF document text
    • http://simonjohns.co.uk/uploads/1/3/0/6/130603859/wubabutavupira.pdfIn PDF document text
    • http://mail.sebolt.com/uploads/1/3/0/2/130288394/3555908.pdfIn PDF document text
    • http://mariettasquarefarmersmarket.net/uploads/1/3/1/6/131606335/kazajidafarawaka.pdfIn PDF document text
    • http://demasidomestic.com/uploads/1/3/0/6/130604850/2863cfd0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4F 4448 bytes
SHA-256: 46cf41086a0c1029fbe4be73b81d1cb1353a9c69a6eddef9daa41d68e22f3295
font_01_sfnt_off00006b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B67 10260 bytes
SHA-256: d3a98e71018e6d9c3919b0e22ed41b84d78cc69ede312268eb5ca5f06bca24f0