Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3f7737252faf7e…

MALICIOUS

PDF

36.2 KB Created: 2020-03-20 03:13:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 24b1e6b7cad2a8db05361402ef1c5b00 SHA-1: 95db977c7ffe27591baa0cba74b2e3cb67e33fcd SHA-256: 7b3f7737252faf7e692c54b4ceac315fb045eb560e2180b28e31f9d5e14a2340
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. These links likely lead to malicious websites or content, potentially for SEO manipulation or to host further stages of an attack. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://robertshrigleywoolf.com/uploads/1/3/0/7/130738482/130738482.html#que+es+el+amor+a+dios+segun+la+biblia
    • http://webdisk.scholarshipsforscholarsofmontebello.org/uploads/1/3/0/2/130272648/30add64d8466.pdf
    • http://www.popupgift.shop/uploads/1/3/0/6/130640091/bajaxitanibokisaxemi.pdf
    • http://www.healthylyfestyleliving.com/uploads/1/3/0/2/130270938/913a094a.pdf
    • http://remix.mka.org/uploads/1/3/0/7/130739994/woladigap.pdf
    • http://fitethesarah.com/uploads/1/3/0/7/130740130/c79b90530b53.pdf
    • http://molokaishores.info/uploads/1/3/0/5/130551927/roxokigekox.pdf
    • http://westandbond.com/uploads/1/3/0/3/130323526/5393654.pdf
    • http://jonathonj.com/uploads/1/3/0/7/130776790/begebajirofafetami.pdf
    • http://thestarmethod.com/uploads/1/3/0/6/130604958/5228503.pdf
    • http://trinitygb.co.uk/uploads/1/3/0/3/130379379/zopakogoziten.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_off0000645c.bin
4c1bee7050da37a971c1f8f898fdb4ecd57df3a21bf8adab517c33c7cc7882d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645C 8132 bytes

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