Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ab9f41978de570…

MALICIOUS

PDF

36.5 KB Created: 2020-03-21 15:42:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4bd8811884ad1e255dd8fed50c82e004 SHA-1: 43569c500e8579a69588bfa73c867cebdaa00ecb SHA-256: 67ab9f41978de570dfc1258e9314f9c9c784a5eee0635ff05ed48c54aecd7fe2
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body text, though partially obfuscated, contains a URL that points to a collection of external links, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to a wide array of potentially malicious or SEO-spam related websites.

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://bahamasaugustllc.com/uploads/1/3/0/5/130538995/130538995.html#fracciones+dibujos+ejercicios
    • http://univeoensenada.com/uploads/1/3/0/9/130969327/pevisesafawodix.pdf
    • http://swiitcreations.shop/uploads/1/3/0/5/130541765/cbfe73e43b.pdf
    • http://vidtoys.com/uploads/1/3/0/7/130739878/79797aaa7785272.pdf
    • http://mail.ethanitzkow.com/uploads/1/3/0/5/130539223/zegazutaxozoz_kevur.pdf
    • http://traditioncapitalpartners.com/uploads/1/3/0/6/130621451/pibowukelakakovevebu.pdf
    • http://hostmaster.wedners.de/uploads/1/3/0/6/130605280/4536021.pdf
    • http://www.idbat.com/uploads/1/3/0/6/130604885/dewonufusilojiduvise.pdf
    • http://houseofmercyhostel.org/uploads/1/3/0/5/130551330/mofalinewawimi-tebez-givetonebebulo.pdf
    • http://thesunsetswithoutyou.com/uploads/1/3/0/2/130291544/bizimed.pdf
    • http://www.miabrown.net/uploads/1/3/0/8/130873864/ranum.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_off000063bc.bin
0d507e956af9a780e6a253860ce89b6f5241cc59fa8bce501cc57fc0852727e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BC 8748 bytes

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