Malicious PDF — malware analysis report

Static analysis result for SHA-256 7694d59957d6b200…

MALICIOUS

PDF

52.8 KB Created: 2020-05-28 13:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a86cb701ab03739827d991499eb77003 SHA-1: 88d2e2137a8e981e101c9521d6c3008a1b1ad4de SHA-256: 7694d59957d6b20038aaf7784e29b8234d1732481d411638e08463fc9a960606
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external URLs, one of which is algorithmically generated and points to a PDF file. The ML classifier also flagged this PDF as malicious. The document body contains a cryptic message and references to 'vengeance', suggesting a malicious intent. The presence of embedded URLs and the ML detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 4

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://vleo.brdge.org/uploads/1/3/1/4/131406062/131406062.html#the+only+verdict+is+vengeance PDF link annotation
    • http://timetounwind.net/uploads/1/3/1/3/131398591/bd9db74c7b03fd0.pdfIn PDF document text
    • http://moldremovalspecialistsredlands.com/uploads/1/3/0/5/130540795/bugenitoram.pdfIn PDF document text
    • http://bnaiisraelnc.com/uploads/1/3/0/5/130589036/b0a648.pdfIn PDF document text
    • http://ponyexpressprints.com/uploads/1/3/0/6/130622063/2d44847232e5be.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a229.bin
82d95abf72f47c3983eacb2e3b8113a5588f1bccfb1ccf86acaa45020bfeb068		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA229 11184 bytes

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