Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fb5dffd0ceda78…

MALICIOUS

PDF

42.4 KB Created: 2020-06-05 04:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52e7178b3b12d8316129af5abd1f5051 SHA-1: 1e8bef8059604069296e5daef83cd2e69a6f85a3 SHA-256: 01fb5dffd0ceda7882a8dc16b27d4f343eee62a96774a61047ebf860dfe875ac
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS heuristic also flagged the document with high confidence. The embedded URLs suggest a link farm or redirection scheme, likely intended to manipulate search engine rankings or lead users to malicious content. 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://aaronmager.com/uploads/1/3/0/6/130620275/130620275.html#sophocles+antigone+perseus
    • http://rietdekkersbedrijfzaalberg.nl/uploads/1/3/0/5/130588651/fatewagepewudeg.pdf
    • http://thoughtslefton.com/uploads/1/3/0/7/130775831/75997d4c907.pdf
    • http://neighbors4vorva.com/uploads/1/3/0/7/130739519/rasabemu_pijemepal_jinak.pdf
    • http://garagesong.com/uploads/1/3/0/8/130874146/1150178.pdf
    • http://carboneopenhouse.com/uploads/1/3/0/4/130488946/zenotidizijib.pdf
    • http://aaronmager.com/uploads/1/3/0/6/130620275/terms.html
    • http://aaronmager.com/uploads/1/3/0/6/130620275/dmca.html
    • http://aaronmager.com/uploads/1/3/0/6/130620275/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bibetajon.files.wordpress.com/2020/06/40481766286.pdf
    • https://dugafobipof.files.wordpress.com/2020/06/96417178554.pdf
    • https://degudik.files.wordpress.com/2020/06/6650316253.pdf
    • https://fibizetu452198143.files.wordpress.com/2020/06/11039260823.pdf
    • https://malogekanaf.files.wordpress.com/2020/06/sujafivujoxurone.pdf
    • https://fejeburaru.files.wordpress.com/2020/06/bokusuvalepug.pdf
    • https://tedazusalutu.files.wordpress.com/2020/06/46147196246.pdf
    • https://busamonavek.files.wordpress.com/2020/06/98502621385.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b0.bin
7f2a20d52ebdac1015e097ae76c1dbc70bf6ffc25896e1d30d4776f3a6c658d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B0 23688 bytes

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