Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2f8d41a87c9adc…

MALICIOUS

PDF

56.9 KB Created: 2020-04-05 11:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 56fd839c88b422faa57dc4e78015748c SHA-1: ed4d6e19b1ea859bb8bef96cb14eccbd21e847e5 SHA-256: ae2f8d41a87c9adcfc123e1944ecee8ab24dad29cdc119aedd2a182f9991fb04
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO abuse. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. The embedded URLs suggest a pattern of redirecting users to potentially malicious or spam content. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://angelwellness.net/uploads/1/3/0/5/130551604/130551604.html#cables+de+potencia+definicion PDF link annotation
    • http://martinjoycepaulskinnergolf.com/uploads/1/3/0/2/130289623/niruzulavuva.pdfIn PDF document text
    • http://mpsawa.org/uploads/1/3/0/6/130639977/3a4f7c8bbe.pdfIn PDF document text
    • http://tezamenzelzate.com/uploads/1/3/0/3/130324320/9b5dbf1.pdfIn PDF document text
    • http://ymkpt.info/uploads/1/3/0/5/130541552/cd066e6039.pdfIn PDF document text
    • http://noblenarrows.com/uploads/1/3/1/4/131437756/1781209.pdfIn PDF document text
    • http://murielstorme.com/uploads/1/3/0/8/130815026/5944411.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9375 9564 bytes
SHA-256: 66a742a2f60b93f450b7101123a44aa71d95d3a1b1d8d676646b1818358101c7
font_01_sfnt_off0000b5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A4 2808 bytes
SHA-256: 4787d2c2ac016f983f57aa366e9fd982efde0f4be5bc1285ce64ca5ec1fd78e0
font_02_sfnt_off0000bfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA8 16172 bytes
SHA-256: 611b4a16b41a927328814247544712161d4a1200cce8aecc93dfc09e1466a86f