Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a9dcbd3e6fd443…

MALICIOUS

PDF

41.0 KB Created: 2020-04-06 06:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a0939a8a65d1ed16ed149d575dd12a1 SHA-1: 8bd618a2c922d732c9f0956282e977612ce71cff SHA-256: 23a9dcbd3e6fd443f423d3e63a6831b2296e6ab5b4c1a7910b0f244e76d66e0b
70 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous external URLs, many of which point to PDF files with numeric slugs. This technique is often used to obscure malicious intent and distribute further malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted from this sample.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://wolfecityhomecoming.com/uploads/1/3/0/5/130589315/130589315.html#national+pressure+cooker+no+7+replacement+parts
    • http://timings.ca/uploads/1/3/1/3/131384489/91a47a.pdf
    • http://jacevedo.nyc/uploads/1/3/0/7/130740537/bf065272e23d567.pdf
    • http://scope-for-growth.com/uploads/1/3/1/1/131164366/lomomafed.pdf
    • http://tandaexperience.com/uploads/1/3/0/5/130546457/pajaloso.pdf
    • http://veronicacastroweddingplanner.com/uploads/1/3/1/4/131406804/4935723.pdf
    • http://psiconutricion.net/uploads/1/3/0/7/130740258/denodowo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a5.bin
abb44e46a7452fd39c9eb9c5f38c3b99fc463c4835fcc73628f66a1bcdae41ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A5 8504 bytes
font_01_sfnt_off00008151.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8151 16204 bytes

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