Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda6bed255c41b38…

MALICIOUS

PDF

36.9 KB Created: 2020-05-22 03:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 315b7d840e7dc645f706fb76d02b0752 SHA-1: 8b121c61cef2eda637e0ce2d3673eee169a6a6b6 SHA-256: eda6bed255c41b3875d7bdb419e613fb141d6af0c4e80e59df65e095467910d9
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, characteristic of a link farm or SEO abuse. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior. The ML classifier also flagged the PDF as malicious with high confidence. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://arise73.pleasingfood.com/uploads/1/3/0/7/130776847/130776847.html#pencil+grip+putting
    • http://innovativewellnessllc.com/uploads/1/3/0/6/130621533/4844758.pdf
    • http://johnsonruffinfoundation.com/uploads/1/3/0/6/130621210/jokogave-pudaro.pdf
    • http://rnytech24.com/uploads/1/3/0/7/130738712/gagixi.pdf
    • http://thedykstraconnection.com/uploads/1/3/0/6/130621046/8a5e13bef0cd7.pdf
    • http://bencivilsltd.com/uploads/1/3/0/8/130874307/1842075.pdf
    • http://acolyte-story.com/uploads/1/3/0/8/130814923/96d00b1dbc.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_off00006767.bin
0cbcd35a7fbbeb2ee833221868946d835d810fb28ad969f376ca62432ab4e41d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6767 10288 bytes

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