Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b534729517f2cd…

MALICIOUS

PDF

41.1 KB Created: 2020-04-14 14:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da8bf6379de74538ba6d90f9eb91d6f1 SHA-1: 186890a7f0b30dc9cd44b36b90e9f03ca612496f SHA-256: 21b534729517f2cda1c9ce98c091275109f0316320c4fa7db2c6e52674646e15
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains text related to 'Aws cli cloudformation termination protection', suggesting a lure to attract users interested in technical topics. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://juliehetherington.com/uploads/1/3/1/4/131452753/131452753.html#aws+cli+cloudformation+termination+protection
    • http://decaledinc.com/uploads/1/3/0/4/130476452/9bbcb4b8.pdf
    • http://theorangecountyreview.com/uploads/1/3/0/6/130639504/zikuvozemoxu.pdf
    • http://bodhitreelandscapedesign.com/uploads/1/3/1/4/131437683/dabusesebavuvex_mazav_vijesaxeki_giguzalewoxixuz.pdf
    • http://boncekcleaning.com/uploads/1/3/1/4/131453144/5151538.pdf
    • http://vonleaderrottweilers.com/uploads/1/3/1/4/131438062/2122269.pdf
    • http://canninish.ca/uploads/1/3/0/4/130489833/d691d231547a67.pdf
    • http://crpaintinginc.com/uploads/1/3/0/7/130775823/xagusenosopa-fekepituzojir.pdf
    • http://eurocasta.org/uploads/1/3/0/8/130874455/sidobudipazibo-xoxop-janutumokebu.pdf
    • http://msplantdiv4.com/uploads/1/3/0/4/130476161/5457495.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_off000078ca.bin
22f5e6e61787b35449f002aba10d50066237b7a057f2495c6e55900722853873		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CA 8124 bytes

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