Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bbf93e57ff9caa…

MALICIOUS

PDF

39.5 KB Created: 2020-04-10 05:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ece68d5bca28344aa399bea6a50d6ce2 SHA-1: 455fdabf848f1da304586700b8c5567ce72c39ba SHA-256: 03bbf93e57ff9caa7222c9f8dad606f39f56be5e92391607c16691e22837a14f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection (Pdf.Dropper.Agent-9134854-0) and an ML classifier. It contains a large number of external links, many of which point to PDF files hosted on unrelated domains, suggesting a link farm or redirection mechanism. The embedded document body text, while partially corrupted, contains a URL that is also present in the list of extracted URLs, reinforcing the malicious intent of directing users to external content.

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.
  • ClamAV: Pdf.Dropper.Agent-9134854-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9134854-0
  • 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://natashasimplychats.com/uploads/1/3/0/9/130969212/130969212.html#el+aportes+de+los+incas+a+la+humanidad
    • http://aotkbf.org/uploads/1/3/0/2/130289719/c1cde74.pdf
    • http://rosemaryxu.com/uploads/1/3/0/2/130289774/vurifoxiwidamur.pdf
    • http://lbxhockeytraining.com/uploads/1/3/0/4/130490006/5b308.pdf
    • http://yksconsultancy.com/uploads/1/3/0/4/130483265/f9f4582e83bf19d.pdf
    • http://motft.com/uploads/1/3/1/3/131378806/vevoba-rariwewireper.pdf
    • http://oliviajoneslaw.net/uploads/1/3/0/8/130814288/aa765918a.pdf
    • http://nicholassearle.com/uploads/1/3/0/6/130620853/kinudusamekofun-nuzute-zuliduxum-xamopalijajin.pdf
    • http://stopclassroombias.com/uploads/1/3/0/3/130313081/supulipujo.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_off00006fd7.bin
0fa2e9ab32f2310cb55be0f68a09035c34dc732e177fe48f641664e882eb3b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD7 9220 bytes

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