Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fdba27ddac12f3…

MALICIOUS

PDF

73.2 KB Created: 2020-03-22 11:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3157569ba4e8fb3a8bc2a8a0dfb1fd23 SHA-1: 03c103c319f320711136fe3532f3efa4f0bcd2aa SHA-256: e0fdba27ddac12f35b82669ad704bedaad148f8935346dc205a8b5bf5e72583a
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded URLs. No scripts were extracted, limiting the analysis of specific execution behaviors.

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://everythingglassplus.com/uploads/1/3/0/4/130435722/130435722.html#derecho+romano+resumen+pdf
    • http://www.hanetaustralia.com.au/uploads/1/3/0/6/130621682/zuwuwifuvakaba.pdf
    • http://clubxboxpodcast.com/uploads/1/3/0/5/130590203/1698650.pdf
    • http://sussexdance.net/uploads/1/3/0/2/130287482/ae0fe4.pdf
    • http://amanda-mccall.com/uploads/1/3/0/6/130604382/pesekiwoneserodazo.pdf
    • http://candlesmedia.com/uploads/1/3/0/2/130288554/dasolivowidaf_guzirozop_xaferet_zerirepipimike.pdf
    • http://nicole-florio.com/uploads/1/3/0/7/130739387/3173939.pdf
    • http://shoppedbysteph.com/uploads/1/3/0/6/130639879/mugezuvimokezawukid.pdf
    • http://trialgraphixs.com/uploads/1/3/0/2/130292013/kutojesusezobep-robawewivo-nufefofabawowuz-sutomipazigamov.pdf
    • http://jukeish.com/uploads/1/3/0/6/130620561/17db0.pdf
    • http://flintfurandfeather.com/uploads/1/3/0/5/130541600/xewele_gumemibu_milefume.pdf
    • http://challengefondo.com/uploads/1/3/0/6/130605355/6458232.pdf
    • http://adenexpress.com/uploads/1/3/0/7/130739910/1759925.pdf
    • http://elliessexysecretslingerie.com/uploads/1/3/0/3/130324386/tokabelexidu.pdf
    • http://thedreamboathealthcollective.com/uploads/1/3/0/8/130874435/fufiripas.pdf
    • http://baltzerrobbins.com/uploads/1/3/0/2/130271111/25f67738c6.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_off0000f4f3.bin
27761e2a0260ed747db0cc133fb6613c1c30fd18d51069c31768de2bdeb0dfbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 9928 bytes

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