Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4528f4f13a57541…

MALICIOUS

PDF

33.1 KB Created: 2020-05-31 00:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d85b247f72dcf3580449fe5737f41a2c SHA-1: ca88ef0c666df1d0c46f9ef873c97089498b5fd9 SHA-256: f4528f4f13a575418959e2fe75f243f3a706e67f5b1f7e8154a156957e965cbb
94 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS classifier also flagged this sample with high confidence. The embedded URLs suggest a link farm or SEO spamming operation, potentially leading to malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://400yearclub.org/uploads/1/3/2/3/132303005/132303005.html#visual+rpg+studio
    • http://1pg.undesirable.us/uploads/1/3/0/7/130738944/migirebixovibu.pdf
    • http://lizzyroyce.com/uploads/1/3/0/8/130873736/busadotikesope.pdf
    • http://walkwithcrystal.com/uploads/1/3/0/5/130588727/12149a6abf069.pdf
    • http://fwaltondumas.com/uploads/1/3/1/3/131397940/f7861207939b1.pdf
    • http://industryvirtualtours.com/uploads/1/3/1/8/131856244/2386999.pdf
    • http://xn--fc-fssen-95a.de/uploads/1/3/0/8/130813714/19bd1ff4a9f.pdf
    • http://iminctrl.net/uploads/1/3/1/4/131438651/demerod.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_off000055c0.bin
25ee95ac1a5f30d4c0e0db5f4e9fe09d9c32ccbed33047029cc820a7c62505c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C0 10644 bytes

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