Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab14a97e03e6572f…

MALICIOUS

PDF

53.1 KB Created: 2020-05-19 18:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fafb1a697b917d14581a18c4f4f4f58e SHA-1: 40f5f63408c8b24256341e806534c04ef98ef4cd SHA-256: ab14a97e03e6572fb7c6a9dcec9e07f2ecd0905851fb0ed7f8f71a26e9a39c24
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains references to URLs that are also present in the extracted URL list. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://blisswise.ca/uploads/1/3/0/4/130488308/130488308.html#oxford+new+english+file+elementary+t
    • http://jblmitzvah.com/uploads/1/3/0/7/130740149/losuto-litewodebasu-filif.pdf
    • http://dixie-glitter-designs.com/uploads/1/3/0/9/130969673/2b6e02f.pdf
    • http://redseaview.be/uploads/1/3/0/3/130379681/34d3e5fa77e7.pdf
    • http://blisstravel.info/uploads/1/3/0/7/130775259/c81c6ef807.pdf
    • http://may-som.com/uploads/1/3/0/7/130775063/823cb211d0.pdf
    • http://makemilesmatter.org/uploads/1/3/0/6/130620620/pevovopinefupono.pdf
    • http://grass-works.com/uploads/1/3/0/3/130323585/todarexu.pdf
    • http://strigiformae.net/uploads/1/3/0/3/130379162/paduvufa-zinuwekudufi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a3e2.bin
f1869803dcb561d2eaed05f77f326e0935119e2fb308d1cea86ad8ab21f359a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3E2 11028 bytes

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