Malicious PDF — malware analysis report

Static analysis result for SHA-256 490d0437c8e50d3f…

MALICIOUS

PDF

34.5 KB Created: 2020-04-05 06:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb0de94bc581052ecf9a18ee8e182e50 SHA-1: fbf27450b18885476aa8c0d170d53dd1304ea42e SHA-256: 490d0437c8e50d3fb3f5d94fb431eb9b4b88e4aab24e20e62dd17b1ffaa89b54
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many pointing to other PDF files on different domains, characteristic of a link farm or SEO spamming operation. The document body, though partially corrupted, contains a URL that is also present in the list of extracted URLs, suggesting a deliberate attempt to direct users to external content. The primary attack pattern appears to be the distribution of a large volume of links, potentially to host malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://extravirgincoffee.com/uploads/1/3/1/3/131380618/131380618.html#malla+curricular+administracion+de+negocios+internacionales+urosario
    • http://spectrumhorizonshealth.net/uploads/1/3/0/2/130289503/zipufir_soruxatu.pdf
    • http://judicalis.org/uploads/1/3/0/6/130639268/2910012.pdf
    • http://illuminatious.com/uploads/1/3/0/7/130775219/1e9c7c21f2e.pdf
    • http://brazilianimage.com/uploads/1/3/0/6/130639729/d8168f28.pdf
    • http://littlebigroompost.com/uploads/1/3/0/6/130605374/nawabewubozi.pdf
    • http://jcmsr4sales.com/uploads/1/3/1/0/131070560/wumusibov.pdf
    • http://thebigfrack.com/uploads/1/3/0/8/130813417/jinirulamevofob-zunelef-rivobo-kazekewug.pdf
    • http://mindregard.com/uploads/1/3/0/7/130739489/5d60dead.pdf
    • http://18390621srn.com/uploads/1/3/0/8/130814226/47aa246e1b.pdf
    • http://aspllcent.com/uploads/1/3/0/6/130621890/7066823.pdf
    • http://injury2019.com/uploads/1/3/1/4/131437354/1098629.pdf
    • http://slantmx.com/uploads/1/3/0/4/130489220/6c0f794317.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_off00005b3d.bin
19bfd646f3e5c56373e27dc79f6e1053c86d5cb0fff610db1694faf9b5cec3d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3D 9320 bytes

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