Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90770ef7bc26414…

MALICIOUS

PDF

38.2 KB Created: 2020-04-13 05:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a4bffa937eb67b8693734c3d703cb70 SHA-1: 3c8146c95f97aadb9009244854d153e01f1028bc SHA-256: c90770ef7bc26414ec2d89ed9be3fffbba987260ad00d2d28cf784ac6553b468
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection strategy. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://emmenriedel.nl/uploads/1/3/0/4/130435741/130435741.html#pandas+dataframe+set+string+value
    • http://justbuddha.com/uploads/1/3/0/4/130435546/viruvivuzutirir_wutebo.pdf
    • http://childproofingcolorado.com/uploads/1/3/0/6/130639831/gugovosezizenijuned.pdf
    • http://mysoulfulmind.com/uploads/1/3/0/6/130621305/romirosiput.pdf
    • http://fastlanehandymanservices.com/uploads/1/3/1/3/131379719/varivodavutofu-nanutovaduto.pdf
    • http://bankersally.com/uploads/1/3/0/4/130489230/9848992.pdf
    • http://sucresoiree.com/uploads/1/3/0/7/130775742/xunuviforapevufojege.pdf
    • http://mastsession.com/uploads/1/3/1/1/131163705/tumoxutowumoruz-damowejevured-dikitejevi-faxerumorugav.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_off000061bc.bin
8d60b99dc8653b57ca5d67dda839800127e5896c74cd5d4ca83c3b0403443157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BC 8696 bytes
font_01_sfnt_off0000833d.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x833D 2652 bytes

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