Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e5735d62e65d4c…

MALICIOUS

PDF

33.1 KB Created: 2020-06-13 00:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 8cd503ff45269cd2be1a0969615efe77 SHA-1: 30706a576c29309efb9a5c9e0c1513de58ad1780 SHA-256: a8e5735d62e65d4c37b495fe90998bd0e55f00ef650912c745554c07aa194c47
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a method to distribute malicious content across multiple sites. The document body contains text that appears to be metadata and garbled content, but the presence of numerous external URLs is the primary indicator of malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mta-sts.mail.meetthemessenger.com/uploads/1/3/0/9/130969221/130969221.html#biozone+answers+pdf PDF link annotation
    • http://firstrealtyschools.com/uploads/1/3/0/6/130620888/betofefepewad-mevisutatikopu-ladowaraviw-mavajixep.pdfIn PDF document text
    • http://thebarkbay.com/uploads/1/3/1/1/131163780/pexovizipezefa-zetuviwubadabeg.pdfIn PDF document text
    • http://elevate-properties.com/uploads/1/3/1/3/131379792/3a9753f0.pdfIn PDF document text
    • http://atlwomentowomen.com/uploads/1/3/0/5/130544190/6685275.pdfIn PDF document text
    • http://innovacionpublicitariamagenta.com/uploads/1/3/1/4/131438362/xinaxa.pdfIn PDF document text
    • http://kariongphysiotherapy.com/uploads/1/3/0/5/130588923/2825192.pdfIn PDF document text
    • http://aldalovell.com/uploads/1/3/1/4/131453684/suxavebar-gefaj-wujexidafexu-wedewenasax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://siluvewonuno.files.wordpress.com/2020/06/gevoruburewogusino.pdfIn PDF document text
    • https://lilozewu.files.wordpress.com/2020/06/92266570508.pdfIn PDF document text
    • https://guzisaka.files.wordpress.com/2020/06/81926983885.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5626 10472 bytes
SHA-256: a2c1f16e1458810a22f0830eb74c3fa844a9c81324608fc73149844d0dd92b63