Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f844870009a0d7…

MALICIOUS

PDF

35.0 KB Created: 2020-06-01 06:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e803d40ac46c529baaabb48764679985 SHA-1: 776486bb2bf8288d7060a4211ce7467c67d41133 SHA-256: 34f844870009a0d71b95e9e912239b02aed7545280b2bdeb53d5bb0c46a9a604
96 Risk Score

Malware Insights

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

The PDF contains a link farm, a common technique for SEO poisoning and distributing malicious content. The primary URL, http://buoyspier37.com/uploads/1/3/0/3/130379147/130379147.html#libros+de+metodos+de+investigacion+gratis, is presented as a free book download, which is a typical lure for phishing or malware delivery. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://buoyspier37.com/uploads/1/3/0/3/130379147/130379147.html#libros+de+metodos+de+investigacion+gratis
    • https://tobofura.files.wordpress.com/2020/05/27507698452.pdf
    • https://zodizijemas.files.wordpress.com/2020/05/67975809023.pdf
    • https://dameniv.files.wordpress.com/2020/05/65029628381.pdf
    • https://zemuderowu.files.wordpress.com/2020/06/zigogeraragabusow.pdf
    • https://jugowaxefij.files.wordpress.com/2020/06/berofe.pdf
    • https://sudevoxe.files.wordpress.com/2020/05/59287569200.pdf
    • https://voxidotusad.files.wordpress.com/2020/05/14367576964.pdf
    • https://fatafujuk.files.wordpress.com/2020/05/pukorixomivodovukorobewe.pdf
    • https://rekinirive.files.wordpress.com/2020/05/fojelixojepimido.pdf
    • https://dasifika.files.wordpress.com/2020/05/13809878444.pdf
    • https://pekuseni.files.wordpress.com/2020/05/16595664605.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_off00005e65.bin
98cdc670a8c631e1daf67a04c946d903a7678a4bf63459bbc151164e8cb1a350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E65 10160 bytes

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