Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb24bef545d756e…

MALICIOUS

PDF

40.8 KB Created: 2020-06-12 11:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15c948830068984ed94aaaf1c6fc03e3 SHA-1: 8a9f2f9e607eb72957ec606de823a7e1c4b6d0fe SHA-256: cbb24bef545d756e02884a40c10963c9e19f0a35d93ca6aa2e85a3d86d220ba6
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to uniquely named PDF files on different domains, indicative of a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests a phishing or content-delivery attack pattern. The document body contains garbled text and URLs, further supporting the malicious intent.

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://sta-66-99-58-203.ladse.org/uploads/1/3/0/6/130621613/130621613.html#thanh+phong+th%25E1%25BA%25A3o+c%25C3%25B3+d%25C3%25B9ng+cho+b%25C3%25A0+b%25E1%25BA%25A7u
    • http://losgatosswingband.com/uploads/1/3/1/3/131381819/widerugopijusawe.pdf
    • http://myiqwealth.com/uploads/1/3/1/3/131383802/9700186.pdf
    • http://shanielos.com/uploads/1/3/1/3/131380993/47723047f4.pdf
    • http://webmail.whimsicalwit.com/uploads/1/3/0/2/130288447/4031254.pdf
    • http://completelycleanedllc.com/uploads/1/3/0/6/130639636/potokux.pdf
    • http://hyunwooyuk.org/uploads/1/3/0/6/130639905/595c06448.pdf
    • http://isanybodylisteningtome.com/uploads/1/3/0/2/130270775/zufuku.pdf
    • http://hostmaster.thesecretwalls.com/uploads/1/3/0/6/130620302/jexedegip.pdf
    • https://pubufifadako.files.wordpress.com/2020/06/14194009689.pdf
    • https://metusazeb.files.wordpress.com/2020/06/40725608842.pdf
    • https://giwubijadefe.files.wordpress.com/2020/06/fepavulixomas.pdf
    • https://puwugeboje.files.wordpress.com/2020/06/lodezekisoxusogulerevulag.pdf
    • https://masivamup.files.wordpress.com/2020/06/zoranizudusozijij.pdf
    • https://mukeninesev.files.wordpress.com/2020/06/53592220836.pdf
    • https://fakesuni.files.wordpress.com/2020/06/kekonomamawodafizazu.pdf
    • https://rejukajalox.files.wordpress.com/2020/06/76072209969.pdf
    • https://sorexujuselu680172323.files.wordpress.com/2020/06/nazidapivuniked.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_off000067f3.bin
7689b44a781b12d90f38ebd0ef82b22795632e8fb886ffe45478a5bf68a1a638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F3 21252 bytes

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