Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edbaf498db0a444…

MALICIOUS

PDF

36.2 KB Created: 2020-04-06 06:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ebc58d49cead64ebdab7bf7c6d149b53 SHA-1: 0c33df6dfec547e0ed389cc53b14f0dda69769d5 SHA-256: 9edbaf498db0a444c5e85d8d2ce1248229945b662c5db4108bdbad4a1b5addad
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to a technical handbook and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The presence of multiple unknown URLs indicates a likely attempt to redirect users to potentially harmful sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://unitedmvp.com/uploads/1/3/0/2/130288381/130288381.html#perry%27s+chemical+engineering+handbook+8th+edition
    • http://easyfreemoneyteam.com/uploads/1/3/0/7/130775870/0eba2356601a.pdf
    • http://damcon.org/uploads/1/3/0/3/130323332/gogunapirixoxar.pdf
    • http://boxedwine.com/uploads/1/3/0/2/130292143/3726027.pdf
    • http://tremaineh.com/uploads/1/3/0/2/130270753/b381224f239df8.pdf
    • http://queenhairandlashes.com/uploads/1/3/0/4/130476205/sefokijepem.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_off000063dc.bin
8237c28d3b1696b8e9d5795f352d4b203ae813c682611e9aff86060c477112d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DC 7820 bytes

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