Malicious PDF — malware analysis report

Static analysis result for SHA-256 813374c2606c9c17…

MALICIOUS

PDF

32.9 KB Created: 2020-04-01 12:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3893ccc8358fc73888e1532860aca6e3 SHA-1: 0ab1101245e4a466e6c1937e1081ad02860ba349 SHA-256: 813374c2606c9c178d72d52bc3c02b76d83546a36efb5d3cd4f67aaa1054a3c8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO poisoning or to distribute malicious payloads. The ML classifier strongly indicated maliciousness. The document body contains garbled text and references to 'wkhtmltopdf', suggesting it was generated programmatically rather than being a legitimate document.

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://theprotocolandetiquetteschool.com/uploads/1/3/0/6/130639343/130639343.html#2013+acc%2Faha%2Fhfsa+heart+failure+guidelines
    • http://absoluteventoparty.com/uploads/1/3/0/4/130477126/2954928.pdf
    • http://moversinriverside.com/uploads/1/3/0/2/130272360/7001186.pdf
    • http://positiveteamcoaching.com/uploads/1/3/1/3/131380836/runaka.pdf
    • http://modernhomebuyers.us/uploads/1/3/0/7/130739476/970ebd9fc4e2693.pdf
    • http://bookkeepingandbusinessconsulting.com/uploads/1/3/0/5/130588363/d0a106795000be.pdf
    • http://wealthyeffort.com/uploads/1/3/0/8/130874009/mamonavewuf-jobat-kebule-jodijib.pdf
    • http://unwindutopia.com/uploads/1/3/0/5/130551116/fa0b1f5c0c91b.pdf
    • http://optimaldbtune.com/uploads/1/3/0/6/130605346/pelazo.pdf
    • http://balibargainflights.com/uploads/1/3/0/8/130874371/1d063bd0bc.pdf
    • http://jplawnsvs.com/uploads/1/3/0/5/130589277/buvejaxebezuse-tatusakil.pdf
    • http://surreypaintpros.com/uploads/1/3/0/7/130776720/f48942a59.pdf
    • http://leadinglegalservice.com/uploads/1/3/0/8/130814469/8165577.pdf
    • http://kccannabizconexpo.com/uploads/1/3/0/4/130490774/b0fbacdebed.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_off000057dd.bin
f48dcf2b8c38f1261546e78cb59a1544009a17a8ed6d8ee283194b566f5d51bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57DD 7368 bytes

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