Malicious PDF — malware analysis report

Static analysis result for SHA-256 685da480647e0e98…

MALICIOUS

PDF

39.8 KB Created: 2020-04-07 13:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f7c101a90486d7a5b9cf6df104396667 SHA-1: fea7936fc196735836a1e65da911c0ccc1e31784 SHA-256: 685da480647e0e98f3166a9bd07c09d87b7727a1aeb553ed0fbe9c6b671b6138
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to manipulate search engine results or redirect users to potentially harmful sites.

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://mychinesewatch.com/uploads/1/3/0/8/130873975/130873975.html#cal+osha+recordkeeping+and+reporting
    • http://extraordinarypartyfavors.com/uploads/1/3/0/9/130969817/jigewexelizedarodus.pdf
    • http://parkerconsultantsllc.com/uploads/1/3/0/7/130739214/xuxewiwoli_toxukezoli.pdf
    • http://hothfitness.com/uploads/1/3/1/0/131071113/f2869.pdf
    • http://theyogapod.sydney/uploads/1/3/1/3/131384255/lobofigusikowaru.pdf
    • http://kylinelsonteaching.com/uploads/1/3/0/4/130483428/befiwajemewevi.pdf
    • http://vincentmillioud.com/uploads/1/3/0/6/130620912/4377829.pdf
    • http://clarkhighschool79.com/uploads/1/3/0/5/130539205/jegus_nidami.pdf
    • http://callthewolves.com/uploads/1/3/1/1/131164257/5229137.pdf
    • http://joarendering.com/uploads/1/3/0/6/130639997/lodisowerijexesib.pdf
    • http://newhopephotographylakeland.com/uploads/1/3/0/5/130539403/5b8d7289.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_off000074b8.bin
8671d9759dd92a8619478dcbb6f7cb994b5c55b8bd3a7cf32e5e0a88885d59d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 7644 bytes

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