Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dcd77b12cce8aa…

MALICIOUS

PDF

33.8 KB Created: 2020-04-20 06:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c03743c46ce0b8d4f361d37bdd34a197 SHA-1: 324e191f76414ff5977bbeb8e1b055817515df8e SHA-256: 77dcd77b12cce8aa133492b657177528a3f4bba9e2bc8deac77d3c04c0bb4bfe
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 other PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'holiday connect the dots worksheets'. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links aligns with techniques used to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://marymckeownmoak.net/uploads/1/3/0/6/130639214/130639214.html#holiday+connect+the+dots+worksheets
    • http://boxpact.com/uploads/1/3/0/5/130589334/jidifomekepogejunosu.pdf
    • http://mudplaytherapy.com/uploads/1/3/0/5/130541028/tekufubadawawo.pdf
    • http://healthandsafetysystemsaustralia.com/uploads/1/3/0/3/130313155/2211788.pdf
    • http://jarsofdirtstaging.com/uploads/1/3/0/5/130590219/58e67240686b.pdf
    • http://vosfurniture.com/uploads/1/3/0/9/130969449/2e2f2.pdf
    • http://eleanorcannonsmith.com/uploads/1/3/0/7/130775880/tawosus-jaxuserul-borotod.pdf
    • http://baylandesign.net/uploads/1/3/1/4/131453706/d82d2c402.pdf
    • http://westchester2021.org/uploads/1/3/1/6/131637240/8712c845.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_off00005e48.bin
65c492cf50256c82c3a53a464213450c2ba1dda0c594507eb40e05472b315ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E48 7444 bytes

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