Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d18940b4a6d6e53…

MALICIOUS

PDF

32.2 KB Created: 2020-06-01 21:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9717eb3876d4ab569effa9d4b4ad56 SHA-1: 0927d29c62d8e36aa24713ed32aa68d7abc4f826 SHA-256: 8d18940b4a6d6e53d4c948802b23d6e8a4ebc06d1d6574c31d07db5f70283ee7
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a link farm or distribution mechanism for further malicious content, potentially related to SEO manipulation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vibrationalworld.eu/uploads/1/3/0/3/130313228/130313228.html#noble+maiden+fair+lyrics+pronunciation
    • http://refineryclocks.com/uploads/1/3/0/3/130313289/69583e6a66.pdf
    • http://nearshoremultisports.com/uploads/1/3/0/2/130271042/3360264.pdf
    • http://lataverne.org/uploads/1/3/0/5/130539849/xemodivi.pdf
    • http://vibrationalworld.eu/uploads/1/3/0/3/130313228/terms.html
    • http://vibrationalworld.eu/uploads/1/3/0/3/130313228/dmca.html
    • http://vibrationalworld.eu/uploads/1/3/0/3/130313228/policy.html
    • https://morixumudiba.files.wordpress.com/2020/05/kagisilafawonegibelewewon.pdf
    • https://sinezuve.files.wordpress.com/2020/05/fuxejarobagibijibawimu.pdf
    • https://dipabaze.files.wordpress.com/2020/05/91968444049.pdf
    • https://jefebelumewo.files.wordpress.com/2020/05/86528679896.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_off0000523d.bin
19f3a5e2c4845cb393f68ab668bef5e5310a0db24c2eb26823126676409c95a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x523D 10896 bytes

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