Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90f1687091b41da…

MALICIOUS

PDF

42.3 KB Created: 2020-06-17 11:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 99274a01b76a380acc4209d997ada49a SHA-1: e99725d24c87f536c48f39e2c517d65df25ef6bb SHA-256: f90f1687091b41da76a030f5d9764f791533e91dbe6b7841a4ee20b88876dc40
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and a significant number of external links, many of which point to other PDF files hosted on similar domains. This pattern is indicative of a link farm or redirection scheme designed to obscure the ultimate malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended to deliver a secondary payload or lead the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://costassolutions.com/uploads/1/3/1/0/131070971/131070971.html#code+composer+tutorial PDF link annotation
    • http://girvetcreations.net/uploads/1/3/0/8/130814935/d100c5cff5.pdfIn PDF document text
    • http://windyacrespickles.com/uploads/1/3/1/3/131378771/3843295.pdfIn PDF document text
    • http://jameswolcottproperties.com/uploads/1/3/0/2/130289735/vijaserenaxof.pdfIn PDF document text
    • http://sjcconsulting.org/uploads/1/3/0/5/130588702/9492335.pdfIn PDF document text
    • http://ourbeautifulfeet.org/uploads/1/3/1/6/131636845/6166154.pdfIn PDF document text
    • http://sencilloelegante.com/uploads/1/3/1/0/131070230/pitilisivaf-duzirarolanaril-bedikapuvewe.pdfIn PDF document text
    • http://spreadlovelivepeace.com/uploads/1/3/0/4/130435875/tanalinupodo.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000684a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x684A 5020 bytes
SHA-256: 358ca4385956c26db5349df6ad3ab3ed8cd4e07b5e685d06efd31668bf22f1f7
font_01_sfnt_off0000795b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x795B 10016 bytes
SHA-256: 6ded12dae39a3b6fff084713b2eba559abec4375264d82abfb4ff88804c1ddee

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