Malicious PDF — malware analysis report

Static analysis result for SHA-256 7159d77d9fdf2cbb…

MALICIOUS

PDF

34.8 KB Created: 2020-04-06 08:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f6a41f9a508e0f71008bdaba84495b09 SHA-1: fc2e9703dc292068a6de0032b49022e6b8a4b140 SHA-256: 7159d77d9fdf2cbb48bdb269d0aa64362ee800b55d96aa7b06d9e86fca067a8d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely serve as a link farm to distribute malicious content or for SEO manipulation, and the document itself is likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://spectrumherniaclinic.com/uploads/1/3/0/4/130488816/130488816.html#causas+economicasde+la+primera+guerra+mundial
    • http://quarkinstitute.com/uploads/1/3/0/4/130477755/5e51bd3db.pdf
    • http://alpharcg.com/uploads/1/3/0/2/130272389/8425611.pdf
    • http://amysonlr.eu/uploads/1/3/0/4/130483386/4118429.pdf
    • http://mmsestatelettings.com/uploads/1/3/0/6/130639725/jezugotufan-fegogipumoxe-dokigi.pdf
    • http://foxfanatic.com/uploads/1/3/0/8/130874523/1ad404ca6f867.pdf
    • http://rebeccasmithphotography.org/uploads/1/3/0/7/130740414/9411645.pdf
    • http://offalyit.com/uploads/1/3/0/2/130272240/figuje.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_off00005f50.bin
832db71f68df2a6606a252b5b6e334ecd02a158fa844a8011de730d3c03d2929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F50 7948 bytes

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