Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc27eeb97e0d124…

MALICIOUS

PDF

37.2 KB Created: 2020-06-29 22:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82313f500794c7d0db4ec33c4bf5cac3 SHA-1: 5f7d525a1345712645069d88674afdc2cd4a5667 SHA-256: 6cc27eeb97e0d124fe1854072af8366825f76c00cffd8387dc578ef988a1f889
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely lead to malicious content or phishing pages, and the document body itself contains some of these URLs, suggesting a lure to external resources.

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://files.depedkabankalancity.com/uploads/1/3/1/4/131408581/131408581.html#triangle+and+rectangular+prisms+worksheets
    • http://mta-sts.mx.japhotos.me/uploads/1/3/0/5/130590509/242903.pdf
    • http://mta-sts.mx.mbv41.com/uploads/1/3/1/3/131384255/fc330289dc7.pdf
    • http://nealcoxrealty.net/uploads/1/3/0/6/130621217/koxuxiw.pdf
    • http://riseforhope.com/uploads/1/3/0/7/130739341/pivizokuk_fenofo.pdf
    • http://3xa.undesirable.us/uploads/1/3/0/6/130639180/2292539.pdf
    • http://bluesuede.net/uploads/1/3/1/3/131398425/4a87039d6ac8a.pdf
    • http://portsmouthboilerrepair.com/uploads/1/3/0/7/130739206/gobaravut.pdf
    • http://theoprobe.com/uploads/1/3/2/3/132303163/15b37f3.pdf
    • http://cpanel.stream-4u.com/uploads/1/3/0/8/130874286/bb1b2166ea86.pdf
    • http://urchig.com/uploads/1/3/0/5/130588861/4545085.pdf
    • http://manageyourlifebook.com/uploads/1/3/1/8/131856903/22d6918.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zosomofop.files.wordpress.com/2020/06/46666920098.pdf
    • https://wilewivim.files.wordpress.com/2020/06/23930595122.pdf
    • https://mojokego.files.wordpress.com/2020/06/52106001967.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005347.bin
5ba5f1a5e50a495121caa8b95b5858361d4741321f4906c85c3bd9b3ea8337e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5347 5472 bytes
font_01_sfnt_off000065ba.bin
b359562d62065b9e2393168be7b0c44db0fdee037a63855bb04805abbc8d95a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 10152 bytes

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