Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7b4473e21db8f4…

MALICIOUS

PDF

32.2 KB Created: 2020-05-26 05:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 69342e11966aaae454a1af089477f906 SHA-1: d21bbd40f20afff329f392de1b238f985d87e129 SHA-256: 8a7b4473e21db8f4c8c3c6f2146a55f3e1817262e0f17011f3af5c176b0b98e3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains URLs pointing to a link farm hosted on various domains. These links likely lead to further malicious content or phishing pages. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jcfoamer.com/uploads/1/3/1/8/131871825/131871825.html#birthday+weekend+itinerary+template PDF link annotation
    • http://bugs.ikiru.org/uploads/1/3/0/8/130814402/nupaxe_risazimopaz_kobogabowu.pdfIn PDF document text
    • http://sunsetcafechicago.com/uploads/1/3/0/3/130313093/e130957653.pdfIn PDF document text
    • http://mtlemmonskylodge.com/uploads/1/3/0/6/130605390/lowodewofopup.pdfIn PDF document text
    • http://lunalolasc.com/uploads/1/3/0/7/130739020/fitupadil.pdfIn PDF document text
    • http://bluearchconsulting.com/uploads/1/3/0/3/130323106/wafofojiv.pdfIn PDF document text
    • http://castellumcareer.com/uploads/1/3/0/8/130814423/6515326.pdfIn PDF document text
    • http://seraphimatx.com/uploads/1/3/1/3/131398374/7293126.pdfIn PDF document text
    • http://puravegan.net/uploads/1/3/0/5/130542982/xalezizoleni.pdfIn PDF document text
    • http://theycallmefrida.com/uploads/1/3/0/7/130775563/4025806.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 1

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53B8 9960 bytes
SHA-256: d5832fe572fdd4c10ae91bb1fc4273e5425690d371f92c47a896cf065bab7a5c

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