Malicious PDF — malware analysis report

Static analysis result for SHA-256 1244f5f55a78c29b…

MALICIOUS

PDF

38.2 KB Created: 2020-06-16 18:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88611ba0fdf9c71d2ddf9fd8e0ddf27a SHA-1: a5e96c94310283c06c5dccc111525cf33999f31f SHA-256: 1244f5f55a78c29bc2f472e7f9535c105acb45329f0b0a2234c5f1078aa1e0a7
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files hosted on various domains. This pattern is indicative of a link farm designed to generate traffic or potentially host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://sistereducator.com/uploads/1/3/0/4/130435872/130435872.html#marijuana+horticulture+pdf+free
    • http://testors.southerncommunitystudy.org/uploads/1/3/1/4/131406433/lorixibazakudupij.pdf
    • http://ditachin.org/uploads/1/3/0/5/130538985/d1fe6bd.pdf
    • http://mail.tntbigskyboutique.com/uploads/1/3/0/2/130287537/zoxeduzu_wuwajapab_tatixexe_sigofibigarof.pdf
    • http://slowopauza.com/uploads/1/3/0/4/130483903/dokogebovive.pdf
    • http://northhaledontreeexperts.com/uploads/1/3/1/3/131398259/09a795.pdf
    • http://kristinchiu.com/uploads/1/3/1/4/131409755/63de0.pdf
    • http://beltavolo.com/uploads/1/3/1/6/131636987/5555079.pdf
    • http://rockymountainalpacas.com/uploads/1/3/0/2/130272435/01009d86d.pdf
    • http://sophistable.com/uploads/1/3/1/3/131383646/lifozasaj.pdf
    • http://lgpropertymaintenance.trustabiz.com/uploads/1/3/1/6/131637242/lurezixokuzuxubosomo.pdf
    • http://illustratie57.com/uploads/1/3/0/6/130620491/kikomatovunar-kexagu-kiposes.pdf
    • http://hostmaster.winefest.ca/uploads/1/3/0/5/130551399/fbd95cf6a93d3a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off000059c4.bin
f9b078291d5e0cb02023f035ebf1bc002c0ade5753861005c4c46a4a999962c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C4 5028 bytes
font_01_sfnt_off00006ad6.bin
0e22b6274967a922054ec46734a247570fc971277c2e4e9777de92ce37c90304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD6 9712 bytes

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