Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0546356d5fbce7…

MALICIOUS

PDF

36.9 KB Created: 2020-03-29 07:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2cd8de1ed02e34c6d05719064003897e SHA-1: a76d6c7724321ad83672b73ba98f7ffcc594fc38 SHA-256: 4a0546356d5fbce7bab16ee04af6de43e463c630ef5927c81c1701e5c8e22b28
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO scam. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the presence of numerous external links suggests the primary intent is to redirect the user to malicious content hosted elsewhere.

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://sta-66-99-58-206.ladse.org/uploads/1/3/0/2/130273812/130273812.html#concepto+de+regimen+fiscal+preferente
    • http://cre8.work/uploads/1/3/0/4/130476657/1646590.pdf
    • http://www.easyfixsolutions.ca/uploads/1/3/0/7/130739934/ravum.pdf
    • http://mollymagdalain.com/uploads/1/3/0/8/130814209/758705.pdf
    • http://faicseat.com/uploads/1/3/0/2/130271205/a77e5e060f21.pdf
    • http://wojtasekrealty.com/uploads/1/3/0/7/130739476/85052e303d5022.pdf
    • http://paynezone.com/uploads/1/3/0/5/130539714/vozipinej.pdf
    • http://just-dough.net/uploads/1/3/0/5/130551770/4575083.pdf
    • http://www.mariacarasuarez.com/uploads/1/3/0/5/130588695/tapaxetadizipagaxa.pdf
    • http://gratiotcountyfreeclinic.net/uploads/1/3/0/7/130739578/bodivejolazegufad.pdf
    • http://thedevitorealestategroup.net/uploads/1/3/0/6/130639317/3505114.pdf
    • http://www.cdbtpsych.com/uploads/1/3/0/2/130287971/4565777.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_off00006954.bin
ee33de9ee5dbb0339ad450e3da7ff62ef0be9851d7af216f5a1948f5f68bf801		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6954 7504 bytes

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