Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef39896d2228b7d…

MALICIOUS

PDF

37.0 KB Created: 2020-04-11 05:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0b69077b18d07c21d873ecd04c5d96f4 SHA-1: 1b936cab80f1c921a19bf7de209795055674096d SHA-256: aef39896d2228b7d5762b299b9af960f90d1b1e7261dd9a9ac13e0360d4ce19b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains and appear to be part of a link farm designed to manipulate search engine results. The document body text, though garbled, contains a reference to 'Diccionario biblico mundo hispano pd' and a URL that matches one of the extracted suspicious links. This suggests a lure to a website that may host malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://74-123-79-94.mgwnet.com/uploads/1/3/1/4/131453323/131453323.html#diccionario+biblico+mundo+hispano+pd
    • http://nearshoresports.com/uploads/1/3/0/5/130589228/tesutizexuw.pdf
    • http://cart-science.org/uploads/1/3/0/5/130543671/5883853.pdf
    • http://raytastics-light.com/uploads/1/3/0/7/130776340/kifuj.pdf
    • http://claudiamurphy.com/uploads/1/3/0/9/130969503/2920596.pdf
    • http://the-first-choice-travel.com/uploads/1/3/0/6/130605426/darozima-kugefukulop.pdf
    • http://spurcamp.org/uploads/1/3/0/5/130547613/2e43481d013.pdf
    • http://hapaxcreativestrategies.com/uploads/1/3/0/3/130313306/4669975.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_off000064f2.bin
f204331db87b9b67acb753eeb74553e021418d7dca1f51bf9805b86a31160ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F2 9332 bytes

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