Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eef03a8a7e7c104…

MALICIOUS

PDF

29.2 KB Created: 2020-05-31 06:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4cd19c03d9f892f0dce4a78c33a8c55 SHA-1: 6bfc3aa37d5bc002d9e0deb9eb8bd756baffa62e SHA-256: 5eef03a8a7e7c1048b0cdc86bb953f386752accf2998a2679aa865d7cbfd75e4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of outbound links suggests an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://michava.com/uploads/1/3/0/6/130621997/130621997.html#dear+theodosia+piano+sheet+music+pdf
    • http://thelunadesigns.com/uploads/1/3/0/6/130621369/8495146.pdf
    • http://amanda-mcdonald.com/uploads/1/3/0/9/130969932/9990930.pdf
    • http://shepherdsviewalf.com/uploads/1/3/0/3/130324027/2daeb.pdf
    • http://iguassuac.com/uploads/1/3/0/2/130270913/vuraxobaj.pdf
    • http://carpetcleanerfwb.com/uploads/1/3/0/3/130379194/pafakarolekiw.pdf
    • http://keyplanningsolutions.com/uploads/1/3/0/7/130776388/809862d94132.pdf
    • http://liderarsoluciones.com/uploads/1/3/0/5/130551670/podexotawuvilumivemu.pdf
    • http://danieleporretta.com/uploads/1/3/1/4/131483128/4240a21d7dd6086.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000499f.bin
1a1b8e64c04040a8ec927ec3e5da1546fefaa6ec24611e8b656d4e0fbaef0eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x499F 10512 bytes

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