Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb91f987b4218a4…

MALICIOUS

PDF

41.0 KB Created: 2020-04-02 16:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1c1f3fea8d21e66fb6f3755d4ef555ec SHA-1: 4636a0ffc648843b8787acba13f6b9767ed06f8d SHA-256: cdb91f987b4218a4a8d18d392156f85e2af9e24399d61a18d839a0133d62cb78
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, contains a URL that points to a gemstone size chart, likely a lure. The primary function appears to be directing users to a multitude of other PDF files hosted across various domains, potentially for SEO manipulation or to serve as a distribution point for further malicious content.

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://customloansforyou.com/uploads/1/3/1/4/131437880/131437880.html#standard+gemstone+size+chart
    • http://woss.biz/uploads/1/3/0/7/130775098/xiwipasemew.pdf
    • http://mlbpservicesllc.com/uploads/1/3/0/6/130604646/4995774b4.pdf
    • http://nickandchels.com/uploads/1/3/0/2/130287401/pobomutizi_gatupozozetunub_wonagurele.pdf
    • http://newleaf.media/uploads/1/3/0/9/130969604/tuzigex.pdf
    • http://scarboroughdispensary.com/uploads/1/3/1/0/131070888/5819241.pdf
    • http://bistro46.net/uploads/1/3/0/8/130813317/kelemal.pdf
    • http://cannablisconsulting.com/uploads/1/3/0/9/130969341/besotoma-satawulur.pdf
    • http://huelsingtrucking.com/uploads/1/3/0/8/130814666/1d18d.pdf
    • http://carolbernabelorganiza.com/uploads/1/3/0/9/130969648/fimav.pdf
    • http://vonkarmanatmain.com/uploads/1/3/0/6/130603852/8554191.pdf
    • http://ooirvie.com/uploads/1/3/0/8/130873990/8602565.pdf
    • http://isu99.org/uploads/1/3/1/4/131452824/21029790.pdf
    • http://foxxgroupservices.com/uploads/1/3/1/0/131070874/zixilapakoxidebulibo.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_off00007566.bin
640e3fa50ddd81bebddf5a3631d9e2a0a79354702a807da6160bdd52e6a4503e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7566 8832 bytes

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