Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8344fc4b8043ab…

MALICIOUS

PDF

37.5 KB Created: 2020-04-04 11:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1747e838bcf45b9c314b062474adcf1d SHA-1: 43bac6aad0126780d941857f581f2bcb49091ab0 SHA-256: 7b8344fc4b8043aba89ff51f99d771ee589dd8e2ad1d7aa977afa226cc13ca24
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, identified as a 'PDF SEO Link Farm' heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely serve as a lure to redirect users to potentially malicious content or further stages of an attack.

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://iphoneplugz.com/uploads/1/3/0/6/130621134/130621134.html#5+ejemplos+de+oligopolio+en+mexico
    • http://toddlertoothcare.com/uploads/1/3/0/2/130274345/eb3e0f.pdf
    • http://quadhealthgroup.com/uploads/1/3/0/3/130313572/rowekexur_rukozo_tidanafefikop.pdf
    • http://strumdown.com/uploads/1/3/0/8/130874601/zewujimenulero_fawimijim.pdf
    • http://medicalmotionllc.com/uploads/1/3/1/1/131164095/gadofenazajojubeb.pdf
    • http://drummade.com/uploads/1/3/0/8/130814581/7819589.pdf
    • http://mainospyloni.com/uploads/1/3/0/7/130776612/61c3eb4.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_off00006926.bin
60ebf2526ce2176312099cdb28d302f87de79561611b02362c60ad5e99976c62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6926 8412 bytes

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